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  • Part IVEnergy Conservation

    CHAPTER11 [RE]
    ENERGY EFFICIENCY

    SECTIONN1101
    GENERAL

    N1101.1 Scope.

    This chapter regulates the energy efficiency for the design and construction of buildings regulated by this code.

    Note: The text of the following Sections N1101.2 through N1105 is extracted from the 2012 edition of the International Energy Conservation Code—Residential Provisions and has been editorially revised to conform to the scope and application of this code. The section numbers appearing in parenthesis after each section number are the section numbers of the corresponding text in the International Energy Conservation Code—Residential Provisions.

    N1101.2 (R101.3) Intent.

    This chapter shall regulate the design and construction of buildings for the effective use and conservation of energy over the useful life of each building. This chapter is intended to provide flexibility to permit the use of innovative approaches and techniques to achieve this objective. This chapter is not intended to abridge safety, health or environmental requirements contained in other applicable codes or ordinances.

    N1101.3 (R101.5.1) Compliance materials.

    The building official shall be permitted to approve specific computer software, worksheets, compliance manuals and other similar materials that meet the intent of this code.

    N1101.4 (R102.1.1) Above code programs.

    The building official or other authority having jurisdiction shall be permitted to deem a national, state or local energy-efficiency program to exceed the energy efficiency required by this code. Buildings approved in writing by such an energy-efficiency program shall be considered in compliance with this code. The requirements identified as “mandatory” in this chapter, as applicable, shall be met.

    N1101.5 (R103.2) Information on construction documents.

    Construction documents shall be drawn to scale upon suitable material. Electronic media documents are permitted to be submitted when approved by the building official. Construction documents shall be of sufficient clarity to indicate the location, nature and extent of the work proposed, and show in sufficient detail pertinent data and features of the building, systems and equipment as herein governed. Details shall include, but are not limited to, as applicable:

    1. 1.Insulation materials and their R-values.

    2. 2.Fenestration U-factors and SHGCs.

    3. 3.Area-weighted U-factor and SHGC calculations.

    4. 4.Mechanical system design criteria.

    5. 5.Mechanical and service water heating system and equipment types, sizes and efficiencies.

    6. 6.Equipment and system controls.

    7. 7.Duct sealing, duct and pipe insulation and location.

    8. 8.Air sealing details.

    N1101.5.1 (R103.2.1) Thermal envelope depiction.

    The building’s thermal envelope shall be represented on the construction drawings.

    N1101.6 (R202) Defined terms.

    The following words and terms shall, for the purposes of this chapter, have the meanings shown herein.

    ABOVE-GRADE WALL. A wall more than 50 percent above grade and enclosing conditioned space. This includes between-floor spandrels, peripheral edges of floors, roof and basement knee walls, dormer walls, gable end walls, walls enclosing a mansard roof and skylight shafts.

    ACCESSIBLE. Admitting close approach as a result of not being guarded by locked doors, elevation or other effective means (see “Readily accessible”).

    ADDITION. An extension or increase in the conditioned space floor area or height of a building or structure.

    AIR BARRIER. Material(s) assembled and joined together to provide a barrier to air leakage through the building envelope. An air barrier may be a single material or a combination of materials.

    ALTERATION. Any construction, retrofit or renovation to an existing structure other than repair or addition that requires a permit. Also, a change in a building, electrical, gas, mechanical or plumbing system that involves an extension, addition or change to the arrangement, type or purpose of the original installation that requires a permit.

    AUTOMATIC. Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current strength, pressure, temperature or mechanical configuration (see “Manual”).

    BASEMENT WALL. A wall 50 percent or more below grade and enclosing conditioned space.

    BUILDING. Any structure used or intended for supporting or sheltering any use or occupancy, including any mechanical systems, service water heating systems and electric power and lighting systems located on the building site and supporting the building.

    BUILDING SITE. A continguous area of land that is under the ownership or control of one entity.

    BUILDING THERMAL ENVELOPE. The basement walls, exterior walls, floor, roof and any other building elements that enclose conditioned space or provide a boundary between conditioned space and exempt or unconditioned space.

    C-FACTOR (THERMAL CONDUCTANCE). The coefficient of heat transmission (surface to surface) through a building component or assembly, equal to the time rate of heat flow per unit area and the unit temperature difference between the warm side and cold side surfaces (Btu/h · ft2 · °F) [W/(m2 · K)].

    CIRCULATING HOT WATER SYSTEM. A specifically designed water distribution system where one or more pumps are operated in the service hot water piping to circulate heated water from the water-heating equipment to fixtures and back to the water-heating equipment.

    CLIMATE ZONE. A geographical region based on climatic criteria as specified in this code.

    CONDITIONED FLOOR AREA. The horizontal projection of the floors associated with the conditioned space.

    CONDITIONED SPACE. An area, room or space that is enclosed within the building thermal envelope and that is directly heated or cooled or indirectly heated or cooled. Spaces are indirectly heated or cooled where they communicate through openings with conditioned spaces, where they are separated from conditioned spaces by uninsulated walls, floors or ceilings, or where they contain uninsulated ducts, piping or other sources of heating or cooling.

    CONTINUOUS AIR BARRIER. A combination of materials and assemblies that restrict or prevent the passage of air through the building thermal envelope.

    CONTINUOUS INSULATION (ci). Insulating material that is continuous across all structural members without thermal bridges other than fasteners and service openings. It is installed on the interior or exterior, or is integral to any opaque surface, of the building envelope.

    CRAWL SPACE WALL. The opaque portion of a wall that encloses a crawl space and is partially or totally below grade.

    CURTAIN WALL. Fenestration products used to create an external nonload-bearing wall that is designed to separate the exterior and interior environments.

    DEMAND RECIRCULATION WATER SYSTEM. A water distribution system where pump(s) prime the service hot water piping with heated water upon demand for hot water.

    DUCT. A tube or conduit utilized for conveying air. The air passages of self-contained systems are not to be construed as air ducts.

    DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment and appliances.

    ENERGY ANALYSIS. A method for estimating the annual energy use of the proposed design and standard reference design based on estimates of energy use.

    ENERGY COST. The total estimated annual cost for purchased energy for the building functions regulated by this code, including applicable demand charges.

    ENERGY SIMULATION TOOL. An approved software program or calculation-based methodology that projects the annual energy use of a building.

    ERI REFERENCE DESIGN. A version of the rated design that meets the minimum requirements of the 2006 International Energy Conservation Code.

    EXTERIOR WALL. Walls including both above-grade walls and basement walls.

    FENESTRATION. Products classified as either vertical fenestration or skylights.

    FENESTRATION PRODUCT, SITE-BUILT. A fenestration designed to be made up of field-glazed or field-assembled units using specific factory cut or otherwise factory-formed framing and glazing units. Examples of site-built fenestration include storefront systems, curtain walls, and atrium roof systems.

    FENESTRATION, VERTICAL. Windows (fixed or moveable), opaque doors, glazed doors, glazed block and combination opaque/glazed doors composed of glass or other transparent or translucent glazing materials and installed at a slope of a least 60 degrees (1.05 rad) from horizontal.

    HEATED SLAB. Slab-on-grade construction in which the heating elements, hydronic tubing, or hot air distribution system is in contact with, or placed within or under, the slab.

    HIGH-EFFICACY LAMPS. Compact fluorescent lamps, T-8 or smaller diameter linear fluorescent lamps, or lamps with a minimum efficacy of:

    1. 1.60 lumens per watt for lamps over 40 watts;

    2. 2.50 lumens per watt for lamps over 15 watts to 40 watts; and

    3. 3.40 lumens per watt for lamps 15 watts or less.

    HISTORIC BUILDING. Any building or structure that is one or more of the following:

    1. 1.Listed, or certified as eligible for lising by the State Historic Preservation Officer or the Keeper of the National Register of Historic Places, in the National Register of Historic Places.

    2. 2.Designated as historic under an applicable state or local law.

    3. 3.Certified as a contributing resource within a National Register-listed, state-designated or locally designated historic distsrict.

    INFILTRATION. The uncontrolled inward air leakage into a building caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density or both.

    INSULATED SIDING. A type of continuous insulation with manufacturer-installed insulating material as an integral part of the cladding product having a minimum R-value of R-2.

    INSULATING SHEATHING. An insulating board with a core material having a minimum R-value of R-2.

    LOW-VOLTAGE LIGHTING. Lighting equipment powered through a transformer such as a cable conductor, a rail conductor and track lighting.

    MANUAL. Capable of being operated by personal intervention (see “Automatic”).

    PROPOSED DESIGN. A description of the proposed building used to estimate annual energy use for determining compliance based on total building performance.

    RATED DESIGN. A description of the proposed building used to determine the energy rating index.

    READILY ACCESSIBLE. Capable of being reached quickly for operation, renewal or inspection without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders or access equipment (see “Accessible”).

    REPAIR. The reconstruction or renewal of any part of an existing building for the purpose of its maintenance or to correct damage. For definitions applicable in Chapter 11, see Section N1101.9.

    REROOFING. The process of recovering or replacing an existing roof covering. See “Roof recover” and “Roof replacement.”

    RESIDENTIAL BUILDING. For this chapter, includes detached one- and two-family dwellings and multiple single-family dwellings (townhouses) as well as Group R-2, R-3 and R-4 buildings three stories or less in height above grade plane.

    ROOF RECOVER. The process of installing an additional roof covering over a prepared existing roof covering without removing the existing roof covering.

    ROOF REPAIR. Reconstruction or renewal of any part of an existing roof for the purposes of its maintenance.

    ROOF REPLACEMENT. The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.

    R-VALUE (THERMAL RESISTANCE). The inverse of the time rate of heat flow through a body from one of its bounding surfaces to the other surface for a unit temperature difference between the two surfaces, under steady state conditions, per unit area (h · ft2 · °F/Btu) [(m2 · K)/W].

    SERVICE WATER HEATING. Supply of hot water for purposes other than comfort heating.

    SKYLIGHT. Glass or other transparent or translucent glazing material installed at a slope of less than 60 degrees (1.05 rad) from horizontal. Glazing material in skylights, including unit skylights, solariums, sunrooms, roofs and sloped walls is included in this definition.

    SOLAR HEAT GAIN COEFFICIENT (SHGC). The ratio of the solar heat gain entering the space through the fenestration assembly to the incident solar radiation. Solar heat gain includes directly transmitted solar heat and absorbed solar radiation that is then reradiated, conducted or convected into the space.

    STANDARD REFERENCE DESIGN. A version of the proposed design that meets the minimum requirements of this code and is used to determine the maximum annual energy use requirement for compliance based on total building performance.

    SUNROOM. A one-story structure attached to a dwelling with a glazing area in excess of 40 percent of the gross area of the structure’s exterior walls and roof.

    THERMAL ISOLATION. Physical and space conditioning separation from conditioned space(s). The conditioned space(s) shall be controlled as separate zones for heating and cooling or conditioned by separate equipment.

    THERMOSTAT. An automatic control device used to maintain temperature at a fixed or adjustable set point.

    U-FACTOR (THERMAL TRANSMITTANCE). The coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films (Btu/h · ft2 · °F) [W/(m2 · K)].

    VENTILATION AIR. That portion of supply air that comes from outside (outdoors) plus any recirculated air that has been treated to maintain the desired quality of air within a designated space.

    VISIBLE TRANSMITTANCE [VT]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light, Visible Transmittance, includes the effects of glazing material and frame and is expressed as a number between 0 and 1.

    WHOLE HOUSE MECHANICAL VENTILATION SYSTEM. An exhaust system, supply system, or combination thereof that is designed to mechanically exchange indoor air with outdoor air when operating continuously or through a programmed intermittent schedule to satisfy the whole house ventilation rates.

    ZONE. A space or group of spaces within a building with heating or cooling requirements that are sufficiently similar so that desired conditions can be maintained throughout using a single controlling device.

    N1101.7 (R301.1) Climate zones.

    Climate zones from Figure N1101.7 or Table N1101.7 shall be used in determining the applicable requirements in Sections N1101 through N1111. Locations not in Table N1101.7 (outside the United States) shall be assigned a climate zone based on Section N101.10.2.

    CLIMATE ZONES

    Figure N1101.7 (R301.1)

    CLIMATE ZONES

    TABLE N1101.7 (R301.1)

    CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

    Key: A ‒ Moist, B ‒ Dry, C ‒ Marine. Absence of moisture designation indicates moisture regime is irrelevant. Asterisk (*) indicates a warm-humid location.
    US STATES
    ALABAMA
    3A Autauga*
    2A Baldwin*
    3A Barbour*
    3A Bibb
    3A Blount
    3A Bullock*
    3A Butler*
    3A Calhoun
    3A Chambers
    3A Cherokee
    3A Chilton
    3A Choctaw*
    3A Clarke*
    3A Clay
    3A Cleburne
    3A Coffee*
    3A Colbert
    3A Conecuh*
    3A Coosa
    3A Covington*
    3A Crenshaw*
    3A Cullman
    3A Dale*
    3A Dallas*
    3A DeKalb
    3A Elmore*
    3A Escambia*
    3A Etowah
    3A Fayette
    3A Franklin
    3A Geneva*
    3A Greene
    3A Hale
    3A Henry*
    3A Houston*
    3A Jackson
    3A Jefferson
    3A Lamar
    3A Lauderdale
    3A Lawrence
    3A Lee
    3A Limestone
    3A Lowndes*
    3A Macon*
    3A Madison
    3A Marengo*
    3A Marion
    3A Marshall
    2A Mobile*
    3A Monroe*
    3A Montgomery*
    3A Morgan
    3A Perry*
    3A Pickens
    3A Pike*
    3A Randolph
    3A Russell*
    3A Shelby
    3A St. Clair
    3A Sumter
    3A Talladega
    3A Tallapoosa
    3A Tuscaloosa
    3A Walker
    3A Washington*
    3A Wilcox*
    3A Winston
    ALASKA
    7 Aleutians East
    7 Aleutians West
    7 Anchorage
    8 Bethel
    7 Bristol Bay
    7 Denali
    8 Dillingham
    8 Fairbanks North Star
    7 Haines
    7 Juneau
    7 Kenai Peninsula
    7 Ketchikan Gateway
    7 Kodiak Island
    7 Lake and Peninsula
    7 Matanuska-Susitna
    8 Nome
    8 North Slope
    8 Northwest Arctic
    7 Prince of Wales Outer Ketchikan
    7 Sitka
    7 Skagway-Hoonah-Angoon
    8 Southeast Fairbanks
    7 Valdez-Cordova
    8 Wade Hampton
    7 Wrangell-Petersburg
    7 Yakutat
    8 Yukon-Koyukuk
    ARIZONA
    5B Apache
    3B Cochise
    5B Coconino
    4B Gila
    3B Graham
    3B Greenlee
    2B La Paz
    2B Maricopa
    3B Mohave
    5B Navajo
    2B Pima
    2B Pinal
    3B Santa Cruz
    4B Yavapai
    2B Yuma
    ARKANSAS
    3A Arkansas
    3A Ashley
    4A Baxter
    4A Benton
    4A Boone
    3A Bradley
    3A Calhoun
    4A Carroll
    3A Chicot
    3A Clark
    3A Clay
    3A Cleburne
    3A Cleveland
    3A Columbia*
    3A Conway
    3A Craighead
    3A Crawford
    3A Crittenden
    3A Cross
    3A Dallas
    3A Desha
    3A Drew
    3A Faulkner
    3A Franklin
    4A Fulton
    3A Garland
    3A Grant
    3A Greene
    3A Hempstead*
    3A Hot Spring
    3A Howard
    3A Independence
    4A Izard
    3A Jackson
    3A Jefferson
    3A Johnson
    3A Lafayette*
    3A Lawrence
    3A Lee
    3A Lincoln
    3A Little River*
    3A Logan
    3A Lonoke
    4A Madison
    4A Marion
    3A Miller*
    3A Mississippi
    3A Monroe
    3A Montgomery
    3A Nevada
    4A Newton
    3A Ouachita
    3A Perry
    3A Phillips
    3A Pike
    3A Poinsett
    3A Polk
    3A Pope
    3A Prairie
    3A Pulaski
    3A Randolph
    3A Saline
    3A Scott
    4A Searcy
    3A Sebastian
    3A Sevier*
    3A Sharp
    3A St. Francis
    4A Stone
    3A Union*
    3A Van Buren
    4A Washington
    3A White
    3A Woodruff
    3A Yell
    CALIFORNIA
    3C Alameda
    6B Alpine
    4B Amador
    3B Butte
    4B Calaveras
    3B Colusa
    3B Contra Costa
    4C Del Norte
    4B El Dorado
    3B Fresno
    3B Glenn
    4C Humboldt
    2B Imperial
    4B Inyo
    3B Kern
    3B Kings
    4B Lake
    5B Lassen
    3B Los Angeles
    3B Madera
    3C Marin
    4B Mariposa
    3C Mendocino
    3B Merced
    5B Modoc
    6B Mono
    3C Monterey
    3C Napa
    5B Nevada
    3B Orange
    3B Placer
    5B Plumas
    3B Riverside
    3B Sacramento
    3C San Benito
    3B San Bernardino
    3B San Diego
    3C San Francisco
    3B San Joaquin
    3C San Luis Obispo
    3C San Mateo
    3C Santa Barbara
    3C Santa Clara
    3C Santa Cruz
    3B Shasta
    5B Sierra
    5B Siskiyou
    3B Solano
    3C Sonoma
    3B Stanislaus
    3B Sutter
    3B Tehama
    4B Trinity
    3B Tulare
    4B Tuolumne
    3C Ventura
    3B Yolo
    3B Yuba
    COLORADO
    5B Adams
    6B Alamosa
    5B Arapahoe
    6B Archuleta
    4B Baca
    5B Bent
    5B Boulder
    5B Broomfield
    6B Chaffee
    5B Cheyenne
    7 Clear Creek
    6B Conejos
    6B Costilla
    5B Crowley
    6B Custer
    5B Delta
    5B Denver
    6B Dolores
    5B Douglas
    6B Eagle
    5B Elbert
    5B El Paso
    5B Fremont
    5B Garfield
    5B Gilpin
    7 Grand
    7 Gunnison
    7 Hinsdale
    5B Huerfano
    7 Jackson
    5B Jefferson
    5B Kiowa
    5B Kit Carson
    7 Lake
    5B La Plata
    5B Larimer
    4B Las Animas
    5B Lincoln
    5B Logan
    5B Mesa
    7 Mineral
    6B Moffat
    5B Montezuma
    5B Montrose
    5B Morgan
    4B Otero
    6B Ouray
    7 Park
    5B Phillips
    7 Pitkin
    5B Prowers
    5B Pueblo
    6B Rio Blanco
    7 Rio Grande
    7 Routt
    6B Saguache
    7 San Juan
    6B San Miguel
    5B Sedgwick
    7 Summit
    5B Teller
    5B Washington
    5B Weld
    5B Yuma
    CONNECTICUT
    5A (all)
    DELAWARE
    4A (all)
    DISTRICT OF COLUMBIA
    4A (all)
    FLORIDA
    2A Alachua*
    2A Baker*
    2A Bay*
    2A Bradford*
    2A Brevard*
    1A Broward*
    2A Calhoun*
    2A Charlotte*
    2A Citrus*
    2A Clay*
    2A Collier*
    2A Columbia*
    2A DeSoto*
    2A Dixie*
    2A Duval*
    2A Escambia*
    2A Flagler*
    2A Franklin*
    2A Gadsden*
    2A Gilchrist*
    2A Glades*
    2A Gulf*
    2A Hamilton*
    2A Hardee*
    2A Hendry*
    2A Hernando*
    2A Highlands*
    2A Hillsborough*
    2A Holmes*
    2A Indian River*
    2A Jackson*
    2A Jefferson*
    2A Lafayette*
    2A Lake*
    2A Lee*
    2A Leon*
    2A Levy*
    2A Liberty*
    2A Madison*
    2A Manatee*
    2A Marion*
    2A Martin*
    1A Miami-Dade*
    1A Monroe*
    2A Nassau*
    2A Okaloosa*
    2A Okeechobee*
    2A Orange*
    2A Osceola*
    2A Palm Beach*
    2A Pasco*
    2A Pinellas*
    2A Polk*
    2A Putnam*
    2A Santa Rosa*
    2A Sarasota*
    2A Seminole*
    2A St. Johns*
    2A St. Lucie*
    2A Sumter*
    2A Suwannee*
    2A Taylor*
    2A Union*
    2A Volusia*
    2A Wakulla*
    2A Walton*
    2A Washington*
    GEORGIA
    2A Appling*
    2A Atkinson*
    2A Bacon*
    2A Baker*
    3A Baldwin
    4A Banks
    3A Barrow
    3A Bartow
    3A Ben Hill*
    2A Berrien*
    3A Bibb
    3A Bleckley*
    2A Brantley*
    2A Brooks*
    2A Bryan*
    3A Bulloch*
    3A Burke
    3A Butts
    3A Calhoun*
    2A Camden*
    3A Candler*
    3A Carroll
    4A Catoosa
    2A Charlton*
    2A Chatham*
    3A Chattahoochee*
    4A Chattooga
    3A Cherokee
    3A Clarke
    3A Clay*
    3A Clayton
    2A Clinch*
    3A Cobb
    3A Coffee*
    2A Colquitt*
    3A Columbia
    2A Cook*
    3A Coweta
    3A Crawford
    3A Crisp*
    4A Dade
    4A Dawson
    2A Decatur*
    3A DeKalb
    3A Dodge*
    3A Dooly*
    3A Dougherty*
    3A Douglas
    3A Early*
    2A Echols*
    2A Effingham*
    3A Elbert
    3A Emanuel*
    2A Evans*
    4A Fannin
    3A Fayette
    4A Floyd
    3A Forsyth
    4A Franklin
    3A Fulton
    4A Gilmer
    3A Glascock
    2A Glynn*
    4A Gordon
    2A Grady*
    3A Greene
    3A Gwinnett
    4A Habersham
    4A Hall
    3A Hancock
    3A Haralson
    3A Harris
    3A Hart
    3A Heard
    3A Henry
    3A Houston*
    3A Irwin*
    3A Jackson
    3A Jasper
    2A Jeff Davis*
    3A Jefferson
    3A Jenkins*
    3A Johnson*
    3A Jones
    3A Lamar
    2A Lanier*
    3A Laurens*
    3A Lee*
    2A Liberty*
    3A Lincoln
    2A Long*
    2A Lowndes*
    4A Lumpkin
    3A Macon*
    3A Madison
    3A Marion*
    3A McDuffie
    2A McIntosh*
    3A Meriwether
    2A Miller*
    2A Mitchell*
    3A Monroe
    3A Montgomery*
    3A Morgan
    4A Murray
    3A Muscogee
    3A Newton
    3A Oconee
    3A Oglethorpe
    3A Paulding
    3A Peach*
    4A Pickens
    2A Pierce*
    3A Pike
    3A Polk
    3A Pulaski*
    3A Putnam
    3A Quitman*
    4A Rabun
    3A Randolph*
    3A Richmond
    3A Rockdale
    3A Schley*
    3A Screven*
    2A Seminole*
    3A Spalding
    4A Stephens
    3A Stewart*
    3A Sumter*
    3A Talbot
    3A Taliaferro
    2A Tattnall*
    3A Taylor*
    3A Telfair*
    3A Terrell*
    2A Thomas*
    3A Tift*
    2A Toombs*
    4A Towns
    3A Treutlen*
    3A Troup
    3A Turner*
    3A Twiggs*
    4A Union
    3A Upson
    4A Walker
    3A Walton
    2A Ware*
    3A Warren
    3A Washington
    2A Wayne*
    3A Webster*
    3A Wheeler*
    4A White
    4A Whitfield
    3A Wilcox*
    3A Wilkes
    3A Wilkinson
    3A Worth*
    HAWAII
    1A (all)*
    IDAHO
    5B Ada
    6B Adams
    6B Bannock
    6B Bear Lake
    5B Benewah
    6B Bingham
    6B Blaine
    6B Boise
    6B Bonner
    6B Bonneville
    6B Boundary
    6B Butte
    6B Camas
    5B Canyon
    6B Caribou
    5B Cassia
    6B Clark
    5B Clearwater
    6B Custer
    5B Elmore
    6B Franklin
    6B Fremont
    5B Gem
    5B Gooding
    5B Idaho
    6B Jefferson
    5B Jerome
    5B Kootenai
    5B Latah
    6B Lemhi
    5B Lewis
    5B Lincoln
    6B Madison
    5B Minidoka
    5B Nez Perce
    6B Oneida
    5B Owyhee
    5B Payette
    5B Power
    5B Shoshone
    6B Teton
    5B Twin Falls
    6B Valley
    5B Washington
    ILLINOIS
    5A Adams
    4A Alexander
    4A Bond
    5A Boone
    5A Brown
    5A Bureau
    5A Calhoun
    5A Carroll
    5A Cass
    5A Champaign
    4A Christian
    5A Clark
    4A Clay
    4A Clinton
    5A Coles
    5A Cook
    4A Crawford
    5A Cumberland
    5A DeKalb
    5A De Witt
    5A Douglas
    5A DuPage
    5A Edgar
    4A Edwards
    4A Effingham
    4A Fayette
    5A Ford
    4A Franklin
    5A Fulton
    4A Gallatin
    5A Greene
    5A Grundy
    4A Hamilton
    5A Hancock
    4A Hardin
    5A Henderson
    5A Henry
    5A Iroquois
    4A Jackson
    4A Jasper
    4A Jefferson
    5A Jersey
    5A Jo Daviess
    4A Johnson
    5A Kane
    5A Kankakee
    5A Kendall
    5A Knox
    5A Lake
    5A La Salle
    4A Lawrence
    5A Lee
    5A Livingston
    5A Logan
    5A Macon
    4A Macoupin
    4A Madison
    4A Marion
    5A Marshall
    5A Mason
    4A Massac
    5A McDonough
    5A McHenry
    5A McLean
    5A Menard
    5A Mercer
    4A Monroe
    4A Montgomery
    5A Morgan
    5A Moultrie
    5A Ogle
    5A Peoria
    4A Perry
    5A Piatt
    5A Pike
    4A Pope
    4A Pulaski
    5A Putnam
    4A Randolph
    4A Richland
    5A Rock Island
    4A Saline
    5A Sangamon
    5A Schuyler
    5A Scott
    4A Shelby
    5A Stark
    4A St. Clair
    5A Stephenson
    5A Tazewell
    4A Union
    5A Vermilion
    4A Wabash
    5A Warren
    4A Washington
    4A Wayne
    4A White
    5A Whiteside
    5A Will
    4A Williamson
    5A Winnebago
    5A Woodford
    INDIANA
    5A Adams
    5A Allen
    5A Bartholomew
    5A Benton
    5A Blackford
    5A Boone
    4A Brown
    5A Carroll
    5A Cass
    4A Clark
    5A Clay
    5A Clinton
    4A Crawford
    4A Daviess
    4A Dearborn
    5A Decatur
    5A De Kalb
    5A Delaware
    4A Dubois
    5A Elkhart
    5A Fayette
    4A Floyd
    5A Fountain
    5A Franklin
    5A Fulton
    4A Gibson
    5A Grant
    4A Greene
    5A Hamilton
    5A Hancock
    4A Harrison
    5A Hendricks
    5A Henry
    5A Howard
    5A Huntington
    4A Jackson
    5A Jasper
    5A Jay
    4A Jefferson
    4A Jennings
    5A Johnson
    4A Knox
    5A Kosciusko
    5A Lagrange
    5A Lake
    5A La Porte
    4A Lawrence
    5A Madison
    5A Marion
    5A Marshall
    4A Martin
    5A Miami
    4A Monroe
    5A Montgomery
    5A Morgan
    5A Newton
    5A Noble
    4A Ohio
    4A Orange
    5A Owen
    5A Parke
    4A Perry
    4A Pike
    5A Porter
    4A Posey
    5A Pulaski
    5A Putnam
    5A Randolph
    4A Ripley
    5A Rush
    4A Scott
    5A Shelby
    4A Spencer
    5A Starke
    5A Steuben
    5A St. Joseph
    4A Sullivan
    4A Switzerland
    5A Tippecanoe
    5A Tipton
    5A Union
    4A Vanderburgh
    5A Vermillion
    5A Vigo
    5A Wabash
    5A Warren
    4A Warrick
    4A Washington
    5A Wayne
    5A Wells
    5A White
    5A Whitley
    IOWA
    5A Adair
    5A Adams
    6A Allamakee
    5A Appanoose
    5A Audubon
    5A Benton
    6A Black Hawk
    5A Boone
    6A Bremer
    6A Buchanan
    6A Buena Vista
    6A Butler
    6A Calhoun
    5A Carroll
    5A Cass
    5A Cedar
    6A Cerro Gordo
    6A Cherokee
    6A Chickasaw
    5A Clarke
    6A Clay
    6A Clayton
    5A Clinton
    5A Crawford
    5A Dallas
    5A Davis
    5A Decatur
    6A Delaware
    5A Des Moines
    6A Dickinson
    5A Dubuque
    6A Emmet
    6A Fayette
    6A Floyd
    6A Franklin
    5A Fremont
    5A Greene
    6A Grundy
    5A Guthrie
    6A Hamilton
    6A Hancock
    6A Hardin
    5A Harrison
    5A Henry
    6A Howard
    6A Humboldt
    6A Ida
    5A Iowa
    5A Jackson
    5A Jasper
    5A Jefferson
    5A Johnson
    5A Jones
    5A Keokuk
    6A Kossuth
    5A Lee
    5A Linn
    5A Louisa
    5A Lucas
    6A Lyon
    5A Madison
    5A Mahaska
    5A Marion
    5A Marshall
    5A Mills
    6A Mitchell
    5A Monona
    5A Monroe
    5A Montgomery
    5A Muscatine
    6A O’Brien
    6A Osceola
    5A Page
    6A Palo Alto
    6A Plymouth
    6A Pocahontas
    5A Polk
    5A Pottawattamie
    5A Poweshiek
    5A Ringgold
    6A Sac
    5A Scott
    5A Shelby
    6A Sioux
    5A Story
    5A Tama
    5A Taylor
    5A Union
    5A Van Buren
    5A Wapello
    5A Warren
    5A Washington
    5A Wayne
    6A Webster
    6A Winnebago
    6A Winneshiek
    5A Woodbury
    6A Worth
    6A Wright
    KANSAS
    4A Allen
    4A Anderson
    4A Atchison
    4A Barber
    4A Barton
    4A Bourbon
    4A Brown
    4A Butler
    4A Chase
    4A Chautauqua
    4A Cherokee
    5A Cheyenne
    4A Clark
    4A Clay
    5A Cloud
    4A Coffey
    4A Comanche
    4A Cowley
    4A Crawford
    5A Decatur
    4A Dickinson
    4A Doniphan
    4A Douglas
    4A Edwards
    4A Elk
    5A Ellis
    4A Ellsworth
    4A Finney
    4A Ford
    4A Franklin
    4A Geary
    5A Gove
    5A Graham
    4A Grant
    4A Gray
    5A Greeley
    4A Greenwood
    5A Hamilton
    4A Harper
    4A Harvey
    4A Haskell
    4A Hodgeman
    4A Jackson
    4A Jefferson
    5A Jewell
    4A Johnson
    4A Kearny
    4A Kingman
    4A Kiowa
    4A Labette
    5A Lane
    4A Leavenworth
    4A Lincoln
    4A Linn
    5A Logan
    4A Lyon
    4A Marion
    4A Marshall
    4A McPherson
    4A Meade
    4A Miami
    5A Mitchell
    4A Montgomery
    4A Morris
    4A Morton
    4A Nemaha
    4A Neosho
    5A Ness
    5A Norton
    4A Osage
    5A Osborne
    4A Ottawa
    4A Pawnee
    5A Phillips
    4A Pottawatomie
    4A Pratt
    5A Rawlins
    4A Reno
    5A Republic
    4A Rice
    4A Riley
    5A Rooks
    4A Rush
    4A Russell
    4A Saline
    5A Scott
    4A Sedgwick
    4A Seward
    4A Shawnee
    5A Sheridan
    5A Sherman
    5A Smith
    4A Stafford
    4A Stanton
    4A Stevens
    4A Sumner
    5A Thomas
    5A Trego
    4A Wabaunsee
    5A Wallace
    4A Washington
    5A Wichita
    4A Wilson
    4A Woodson
    4A Wyandotte
    KENTUCKY
    4A (all)
    LOUISIANA
    2A Acadia*
    2A Allen*
    2A Ascension*
    2A Assumption*
    2A Avoyelles*
    2A Beauregard*
    3A Bienville*
    3A Bossier*
    3A Caddo*
    2A Calcasieu*
    3A Caldwell*
    2A Cameron*
    3A Catahoula*
    3A Claiborne*
    3A Concordia*
    3A De Soto*
    2A East Baton Rouge*
    3A East Carroll
    2A East Feliciana*
    2A Evangeline*
    3A Franklin*
    3A Grant*
    2A Iberia*
    2A Iberville*
    3A Jackson*
    2A Jefferson*
    2A Jefferson Davis*
    2A Lafayette*
    2A Lafourche*
    3A La Salle*
    3A Lincoln*
    2A Livingston*
    3A Madison*
    3A Morehouse
    3A Natchitoches*
    2A Orleans*
    3A Ouachita*
    2A Plaquemines*
    2A Pointe Coupee*
    2A Rapides*
    3A Red River*
    3A Richland*
    3A Sabine*
    2A St. Bernard*
    2A St. Charles*
    2A St. Helena*
    2A St. James*
    2A St. John the Baptist*
    2A St. Landry*
    2A St. Martin*
    2A St. Mary*
    2A St. Tammany*
    2A Tangipahoa*
    3A Tensas*
    2A Terrebonne*
    3A Union*
    2A Vermilion*
    3A Vernon*
    2A Washington*
    3A Webster*
    2A West Baton Rouge*
    3A West Carroll
    2A West Feliciana*
    3A Winn*
    MAINE
    6A Androscoggin
    7 Aroostook
    6A Cumberland
    6A Franklin
    6A Hancock
    6A Kennebec
    6A Knox
    6A Lincoln
    6A Oxford
    6A Penobscot
    6A Piscataquis
    6A Sagadahoc
    6A Somerset
    6A Waldo
    6A Washington
    6A York
    MARYLAND
    4A Allegany
    4A Anne Arundel
    4A Baltimore
    4A Baltimore (city)
    4A Calvert
    4A Caroline
    4A Carroll
    4A Cecil
    4A Charles
    4A Dorchester
    4A Frederick
    5A Garrett
    4A Harford
    4A Howard
    4A Kent
    4A Montgomery
    4A Prince George’s
    4A Queen Anne’s
    4A Somerset
    4A St. Mary’s
    4A Talbot
    4A Washington
    4A Wicomico
    4A Worcester
    MASSACHUSETTS
    5A (all)
    MICHIGAN
    6A Alcona
    6A Alger
    5A Allegan
    6A Alpena
    6A Antrim
    6A Arenac
    7 Baraga
    5A Barry
    5A Bay
    6A Benzie
    5A Berrien
    5A Branch
    5A Calhoun
    5A Cass
    6A Charlevoix
    6A Cheboygan
    7 Chippewa
    6A Clare
    5A Clinton
    6A Crawford
    6A Delta
    6A Dickinson
    5A Eaton
    6A Emmet
    5A Genesee
    6A Gladwin
    7 Gogebic
    6A Grand Traverse
    5A Gratiot
    5A Hillsdale
    7 Houghton
    6A Huron
    5A Ingham
    5A Ionia
    6A Iosco
    7 Iron
    6A Isabella
    5A Jackson
    5A Kalamazoo
    6A Kalkaska
    5A Kent
    7 Keweenaw
    6A Lake
    5A Lapeer
    6A Leelanau
    5A Lenawee
    5A Livingston
    7 Luce
    7 Mackinac
    5A Macomb
    6A Manistee
    6A Marquette
    6A Mason
    6A Mecosta
    6A Menominee
    5A Midland
    6A Missaukee
    5A Monroe
    5A Montcalm
    6A Montmorency
    5A Muskegon
    6A Newaygo
    5A Oakland
    6A Oceana
    6A Ogemaw
    7 Ontonagon
    6A Osceola
    6A Oscoda
    6A Otsego
    5A Ottawa
    6A Presque Isle
    6A Roscommon
    5A Saginaw
    6A Sanilac
    7 Schoolcraft
    5A Shiawassee
    5A St. Clair
    5A St. Joseph
    5A Tuscola
    5A Van Buren
    5A Washtenaw
    5A Wayne
    6A Wexford
    MINNESOTA
    7 Aitkin
    6A Anoka
    7 Becker
    7 Beltrami
    6A Benton
    6A Big Stone
    6A Blue Earth
    6A Brown
    7 Carlton
    6A Carver
    7 Cass
    6A Chippewa
    6A Chisago
    7 Clay
    7 Clearwater
    7 Cook
    6A Cottonwood
    7 Crow Wing
    6A Dakota
    6A Dodge
    6A Douglas
    6A Faribault
    6A Fillmore
    6A Freeborn
    6A Goodhue
    7 Grant
    6A Hennepin
    6A Houston
    7 Hubbard
    6A Isanti
    7 Itasca
    6A Jackson
    7 Kanabec
    6A Kandiyohi
    7 Kittson
    7 Koochiching
    6A Lac qui Parle
    7 Lake
    7 Lake of the Woods
    6A Le Sueur
    6A Lincoln
    6A Lyon
    7 Mahnomen
    7 Marshall
    6A Martin
    6A McLeod
    6A Meeker
    7 Mille Lacs
    6A Morrison
    6A Mower
    6A Murray
    6A Nicollet
    6A Nobles
    7 Norman
    6A Olmsted
    7 Otter Tail
    7 Pennington
    7 Pine
    6A Pipestone
    7 Polk
    6A Pope
    6A Ramsey
    7 Red Lake
    6A Redwood
    6A Renville
    6A Rice
    6A Rock
    7 Roseau
    6A Scott
    6A Sherburne
    6A Sibley
    6A Stearns
    6A Steele
    6A Stevens
    7 St. Louis
    6A Swift
    6A Todd
    6A Traverse
    6A Wabasha
    7 Wadena
    6A Waseca
    6A Washington
    6A Watonwan
    7 Wilkin
    6A Winona
    6A Wright
    6A Yellow Medicine
    MISSISSIPPI
    3A Adams*
    3A Alcorn
    3A Amite*
    3A Attala
    3A Benton
    3A Bolivar
    3A Calhoun
    3A Carroll
    3A Chickasaw
    3A Choctaw
    3A Claiborne*
    3A Clarke
    3A Clay
    3A Coahoma
    3A Copiah*
    3A Covington*
    3A DeSoto
    3A Forrest*
    3A Franklin*
    3A George*
    3A Greene*
    3A Grenada
    2A Hancock*
    2A Harrison*
    3A Hinds*
    3A Holmes
    3A Humphreys
    3A Issaquena
    3A Itawamba
    2A Jackson*
    3A Jasper
    3A Jefferson*
    3A Jefferson Davis*
    3A Jones*
    3A Kemper
    3A Lafayette
    3A Lamar*
    3A Lauderdale
    3A Lawrence*
    3A Leake
    3A Lee
    3A Leflore
    3A Lincoln*
    3A Lowndes
    3A Madison
    3A Marion*
    3A Marshall
    3A Monroe
    3A Montgomery
    3A Neshoba
    3A Newton
    3A Noxubee
    3A Oktibbeha
    3A Panola
    2A Pearl River*
    3A Perry*
    3A Pike*
    3A Pontotoc
    3A Prentiss
    3A Quitman
    3A Rankin*
    3A Scott
    3A Sharkey
    3A Simpson*
    3A Smith*
    2A Stone*
    3A Sunflower
    3A Tallahatchie
    3A Tate
    3A Tippah
    3A Tishomingo
    3A Tunica
    3A Union
    3A Walthall*
    3A Warren*
    3A Washington
    3A Wayne*
    3A Webster
    3A Wilkinson*
    3A Winston
    3A Yalobusha
    3A Yazoo
    MISSOURI
    5A Adair
    5A Andrew
    5A Atchison
    4A Audrain
    4A Barry
    4A Barton
    4A Bates
    4A Benton
    4A Bollinger
    4A Boone
    5A Buchanan
    4A Butler
    5A Caldwell
    4A Callaway
    4A Camden
    4A Cape Girardeau
    4A Carroll
    4A Carter
    4A Cass
    4A Cedar
    5A Chariton
    4A Christian
    5A Clark
    4A Clay
    5A Clinton
    4A Cole
    4A Cooper
    4A Crawford
    4A Dade
    4A Dallas
    5A Daviess
    5A DeKalb
    4A Dent
    4A Douglas
    4A Dunklin
    4A Franklin
    4A Gasconade
    5A Gentry
    4A Greene
    5A Grundy
    5A Harrison
    4A Henry
    4A Hickory
    5A Holt
    4A Howard
    4A Howell
    4A Iron
    4A Jackson
    4A Jasper
    4A Jefferson
    4A Johnson
    5A Knox
    4A Laclede
    4A Lafayette
    4A Lawrence
    5A Lewis
    4A Lincoln
    5A Linn
    5A Livingston
    5A Macon
    4A Madison
    4A Maries
    5A Marion
    4A McDonald
    5A Mercer
    4A Miller
    4A Mississippi
    4A Moniteau
    4A Monroe
    4A Montgomery
    4A Morgan
    4A New Madrid
    4A Newton
    5A Nodaway
    4A Oregon
    4A Osage
    4A Ozark
    4A Pemiscot
    4A Perry
    4A Pettis
    4A Phelps
    5A Pike
    4A Platte
    4A Polk
    4A Pulaski
    5A Putnam
    5A Ralls
    4A Randolph
    4A Ray
    4A Reynolds
    4A Ripley
    4A Saline
    5A Schuyler
    5A Scotland
    4A Scott
    4A Shannon
    5A Shelby
    4A St. Charles
    4A St. Clair
    4A Ste. Genevieve
    4A St. Francois
    4A St. Louis
    4A St. Louis (city)
    4A Stoddard
    4A Stone
    5A Sullivan
    4A Taney
    4A Texas
    4A Vernon
    4A Warren
    4A Washington
    4A Wayne
    4A Webster
    5A Worth
    4A Wright
    MONTANA
    6B (all)
    NEBRASKA
    5A (all)
    NEVADA
    5B Carson City (city)
    5B Churchill
    3B Clark
    5B Douglas
    5B Elko
    5B Esmeralda
    5B Eureka
    5B Humboldt
    5B Lander
    5B Lincoln
    5B Lyon
    5B Mineral
    5B Nye
    5B Pershing
    5B Storey
    5B Washoe
    5B White Pine
    NEW HAMPSHIRE
    6A Belknap
    6A Carroll
    5A Cheshire
    6A Coos
    6A Grafton
    5A Hillsborough
    6A Merrimack
    5A Rockingham
    5A Strafford
    6A Sullivan
    NEW JERSEY
    4A Atlantic
    5A Bergen
    4A Burlington
    4A Camden
    4A Cape May
    4A Cumberland
    4A Essex
    4A Gloucester
    4A Hudson
    5A Hunterdon
    5A Mercer
    4A Middlesex
    4A Monmouth
    5A Morris
    4A Ocean
    5A Passaic
    4A Salem
    5A Somerset
    5A Sussex
    4A Union
    5A Warren
    NEW MEXICO
    4B Bernalillo
    5B Catron
    3B Chaves
    4B Cibola
    5B Colfax
    4B Curry
    4B DeBaca
    3B Dona Ana
    3B Eddy
    4B Grant
    4B Guadalupe
    5B Harding
    3B Hidalgo
    3B Lea
    4B Lincoln
    5B Los Alamos
    3B Luna
    5B McKinley
    5B Mora
    3B Otero
    4B Quay
    5B Rio Arriba
    4B Roosevelt
    5B Sandoval
    5B San Juan
    5B San Miguel
    5B Santa Fe
    4B Sierra
    4B Socorro
    5B Taos
    5B Torrance
    4B Union
    4B Valencia
    NEW YORK
    5A Albany
    6A Allegany
    4A Bronx
    6A Broome
    6A Cattaraugus
    5A Cayuga
    5A Chautauqua
    5A Chemung
    6A Chenango
    6A Clinton
    5A Columbia
    5A Cortland
    6A Delaware
    5A Dutchess
    5A Erie
    6A Essex
    6A Franklin
    6A Fulton
    5A Genesee
    5A Greene
    6A Hamilton
    6A Herkimer
    6A Jefferson
    4A Kings
    6A Lewis
    5A Livingston
    6A Madison
    5A Monroe
    6A Montgomery
    4A Nassau
    4A New York
    5A Niagara
    6A Oneida
    5A Onondaga
    5A Ontario
    5A Orange
    5A Orleans
    5A Oswego
    6A Otsego
    5A Putnam
    4A Queens
    5A Rensselaer
    4A Richmond
    5A Rockland
    5A Saratoga
    5A Schenectady
    6A Schoharie
    6A Schuyler
    5A Seneca
    6A Steuben
    6A St. Lawrence
    4A Suffolk
    6A Sullivan
    5A Tioga
    6A Tompkins
    6A Ulster
    6A Warren
    5A Washington
    5A Wayne
    4A Westchester
    6A Wyoming
    5A Yates
    NORTH CAROLINA
    4A Alamance
    4A Alexander
    5A Alleghany
    3A Anson
    5A Ashe
    5A Avery
    3A Beaufort
    4A Bertie
    3A Bladen
    3A Brunswick*
    4A Buncombe
    4A Burke
    3A Cabarrus
    4A Caldwell
    3A Camden
    3A Carteret*
    4A Caswell
    4A Catawba
    4A Chatham
    4A Cherokee
    3A Chowan
    4A Clay
    4A Cleveland
    3A Columbus*
    3A Craven
    3A Cumberland
    3A Currituck
    3A Dare
    3A Davidson
    4A Davie
    3A Duplin
    4A Durham
    3A Edgecombe
    4A Forsyth
    4A Franklin
    3A Gaston
    4A Gates
    4A Graham
    4A Granville
    3A Greene
    4A Guilford
    4A Halifax
    4A Harnett
    4A Haywood
    4A Henderson
    4A Hertford
    3A Hoke
    3A Hyde
    4A Iredell
    4A Jackson
    3A Johnston
    3A Jones
    4A Lee
    3A Lenoir
    4A Lincoln
    4A Macon
    4A Madison
    3A Martin
    4A McDowell
    3A Mecklenburg
    5A Mitchell
    3A Montgomery
    3A Moore
    4A Nash
    3A New Hanover*
    4A Northampton
    3A Onslow*
    4A Orange
    3A Pamlico
    3A Pasquotank
    3A Pender*
    3A Perquimans
    4A Person
    3A Pitt
    4A Polk
    3A Randolph
    3A Richmond
    3A Robeson
    4A Rockingham
    3A Rowan
    4A Rutherford
    3A Sampson
    3A Scotland
    3A Stanly
    4A Stokes
    4A Surry
    4A Swain
    4A Transylvania
    3A Tyrrell
    3A Union
    4A Vance
    4A Wake
    4A Warren
    3A Washington
    5A Watauga
    3A Wayne
    4A Wilkes
    3A Wilson
    4A Yadkin
    5A Yancey
    NORTH DAKOTA
    6A Adams
    7 Barnes
    7 Benson
    6A Billings
    7 Bottineau
    6A Bowman
    7 Burke
    6A Burleigh
    7 Cass
    7 Cavalier
    6A Dickey
    7 Divide
    6A Dunn
    7 Eddy
    6A Emmons
    7 Foster
    6A Golden Valley
    7 Grand Forks
    6A Grant
    7 Griggs
    6A Hettinger
    7 Kidder
    6A LaMoure
    6A Logan
    7 McHenry
    6A McIntosh
    6A McKenzie
    7 McLean
    6A Mercer
    6A Morton
    7 Mountrail
    7 Nelson
    6A Oliver
    7 Pembina
    7 Pierce
    7 Ramsey
    6A Ransom
    7 Renville
    6A Richland
    7 Rolette
    6A Sargent
    7 Sheridan
    6A Sioux
    6A Slope
    6A Stark
    7 Steele
    7 Stutsman
    7 Towner
    7 Traill
    7 Walsh
    7 Ward
    7 Wells
    7 Williams
    OHIO
    4A Adams
    5A Allen
    5A Ashland
    5A Ashtabula
    5A Athens
    5A Auglaize
    5A Belmont
    4A Brown
    5A Butler
    5A Carroll
    5A Champaign
    5A Clark
    4A Clermont
    5A Clinton
    5A Columbiana
    5A Coshocton
    5A Crawford
    5A Cuyahoga
    5A Darke
    5A Defiance
    5A Delaware
    5A Erie
    5A Fairfield
    5A Fayette
    5A Franklin
    5A Fulton
    4A Gallia
    5A Geauga
    5A Greene
    5A Guernsey
    4A Hamilton
    5A Hancock
    5A Hardin
    5A Harrison
    5A Henry
    5A Highland
    5A Hocking
    5A Holmes
    5A Huron
    5A Jackson
    5A Jefferson
    5A Knox
    5A Lake
    4A Lawrence
    5A Licking
    5A Logan
    5A Lorain
    5A Lucas
    5A Madison
    5A Mahoning
    5A Marion
    5A Medina
    5A Meigs
    5A Mercer
    5A Miami
    5A Monroe
    5A Montgomery
    5A Morgan
    5A Morrow
    5A Muskingum
    5A Noble
    5A Ottawa
    5A Paulding
    5A Perry
    5A Pickaway
    4A Pike
    5A Portage
    5A Preble
    5A Putnam
    5A Richland
    5A Ross
    5A Sandusky
    4A Scioto
    5A Seneca
    5A Shelby
    5A Stark
    5A Summit
    5A Trumbull
    5A Tuscarawas
    5A Union
    5A Van Wert
    5A Vinton
    5A Warren
    4A Washington
    5A Wayne
    5A Williams
    5A Wood
    5A Wyandot
    OKLAHOMA
    3A Adair
    3A Alfalfa
    3A Atoka
    4B Beaver
    3A Beckham
    3A Blaine
    3A Bryan
    3A Caddo
    3A Canadian
    3A Carter
    3A Cherokee
    3A Choctaw
    4B Cimarron
    3A Cleveland
    3A Coal
    3A Comanche
    3A Cotton
    3A Craig
    3A Creek
    3A Custer
    3A Delaware
    3A Dewey
    3A Ellis
    3A Garfield
    3A Garvin
    3A Grady
    3A Grant
    3A Greer
    3A Harmon
    3A Harper
    3A Haskell
    3A Hughes
    3A Jackson
    3A Jefferson
    3A Johnston
    3A Kay
    3A Kingfisher
    3A Kiowa
    3A Latimer
    3A Le Flore
    3A Lincoln
    3A Logan
    3A Love
    3A Major
    3A Marshall
    3A Mayes
    3A McClain
    3A McCurtain
    3A McIntosh
    3A Murray
    3A Muskogee
    3A Noble
    3A Nowata
    3A Okfuskee
    3A Oklahoma
    3A Okmulgee
    3A Osage
    3A Ottawa
    3A Pawnee
    3A Payne
    3A Pittsburg
    3A Pontotoc
    3A Pottawatomie
    3A Pushmataha
    3A Roger Mills
    3A Rogers
    3A Seminole
    3A Sequoyah
    3A Stephens
    4B Texas
    3A Tillman
    3A Tulsa
    3A Wagoner
    3A Washington
    3A Washita
    3A Woods
    3A Woodward
    OREGON
    5B Baker
    4C Benton
    4C Clackamas
    4C Clatsop
    4C Columbia
    4C Coos
    5B Crook
    4C Curry
    5B Deschutes
    4C Douglas
    5B Gilliam
    5B Grant
    5B Harney
    5B Hood River
    4C Jackson
    5B Jefferson
    4C Josephine
    5B Klamath
    5B Lake
    4C Lane
    4C Lincoln
    4C Linn
    5B Malheur
    4C Marion
    5B Morrow
    4C Multnomah
    4C Polk
    5B Sherman
    4C Tillamook
    5B Umatilla
    5B Union
    5B Wallowa
    5B Wasco
    4C Washington
    5B Wheeler
    4C Yamhill
    PENNSYLVANIA
    5A Adams
    5A Allegheny
    5A Armstrong
    5A Beaver
    5A Bedford
    5A Berks
    5A Blair
    5A Bradford
    4A Bucks
    5A Butler
    5A Cambria
    6A Cameron
    5A Carbon
    5A Centre
    4A Chester
    5A Clarion
    6A Clearfield
    5A Clinton
    5A Columbia
    5A Crawford
    5A Cumberland
    5A Dauphin
    4A Delaware
    6A Elk
    5A Erie
    5A Fayette
    5A Forest
    5A Franklin
    5A Fulton
    5A Greene
    5A Huntingdon
    5A Indiana
    5A Jefferson
    5A Juniata
    5A Lackawanna
    5A Lancaster
    5A Lawrence
    5A Lebanon
    5A Lehigh
    5A Luzerne
    5A Lycoming
    6A McKean
    5A Mercer
    5A Mifflin
    5A Monroe
    4A Montgomery
    5A Montour
    5A Northampton
    5A Northumberland
    5A Perry
    4A Philadelphia
    5A Pike
    6A Potter
    5A Schuylkill
    5A Snyder
    5A Somerset
    5A Sullivan
    6A Susquehanna
    6A Tioga
    5A Union
    5A Venango
    5A Warren
    5A Washington
    6A Wayne
    5A Westmoreland
    5A Wyoming
    4A York
    RHODE ISLAND
    5A (all)
    SOUTH CAROLINA
    3A Abbeville
    3A Aiken
    3A Allendale*
    3A Anderson
    3A Bamberg*
    3A Barnwell*
    3A Beaufort*
    3A Berkeley*
    3A Calhoun
    3A Charleston*
    3A Cherokee
    3A Chester
    3A Chesterfield
    3A Clarendon
    3A Colleton*
    3A Darlington
    3A Dillon
    3A Dorchester*
    3A Edgefield
    3A Fairfield
    3A Florence
    3A Georgetown*
    3A Greenville
    3A Greenwood
    3A Hampton*
    3A Horry*
    3A Jasper*
    3A Kershaw
    3A Lancaster
    3A Laurens
    3A Lee
    3A Lexington
    3A Marion
    3A Marlboro
    3A McCormick
    3A Newberry
    3A Oconee
    3A Orangeburg
    3A Pickens
    3A Richland
    3A Saluda
    3A Spartanburg
    3A Sumter
    3A Union
    3A Williamsburg
    3A York
    SOUTH DAKOTA
    6A Aurora
    6A Beadle
    5A Bennett
    5A Bon Homme
    6A Brookings
    6A Brown
    6A Brule
    6A Buffalo
    6A Butte
    6A Campbell
    5A Charles Mix
    6A Clark
    5A Clay
    6A Codington
    6A Corson
    6A Custer
    6A Davison
    6A Day
    6A Deuel
    6A Dewey
    5A Douglas
    6A Edmunds
    6A Fall River
    6A Faulk
    6A Grant
    5A Gregory
    6A Haakon
    6A Hamlin
    6A Hand
    6A Hanson
    6A Harding
    6A Hughes
    5A Hutchinson
    6A Hyde
    5A Jackson
    6A Jerauld
    6A Jones
    6A Kingsbury
    6A Lake
    6A Lawrence
    6A Lincoln
    6A Lyman
    6A Marshall
    6A McCook
    6A McPherson
    6A Meade
    5A Mellette
    6A Miner
    6A Minnehaha
    6A Moody
    6A Pennington
    6A Perkins
    6A Potter
    6A Roberts
    6A Sanborn
    6A Shannon
    6A Spink
    6A Stanley
    6A Sully
    5A Todd
    5A Tripp
    6A Turner
    5A Union
    6A Walworth
    5A Yankton
    6A Ziebach
    TENNESSEE
    4A Anderson
    4A Bedford
    4A Benton
    4A Bledsoe
    4A Blount
    4A Bradley
    4A Campbell
    4A Cannon
    4A Carroll
    4A Carter
    4A Cheatham
    3A Chester
    4A Claiborne
    4A Clay
    4A Cocke
    4A Coffee
    3A Crockett
    4A Cumberland
    4A Davidson
    4A Decatur
    4A DeKalb
    4A Dickson
    3A Dyer
    3A Fayette
    4A Fentress
    4A Franklin
    4A Gibson
    4A Giles
    4A Grainger
    4A Greene
    4A Grundy
    4A Hamblen
    4A Hamilton
    4A Hancock
    3A Hardeman
    3A Hardin
    4A Hawkins
    3A Haywood
    3A Henderson
    4A Henry
    4A Hickman
    4A Houston
    4A Humphreys
    4A Jackson
    4A Jefferson
    4A Johnson
    4A Knox
    3A Lake
    3A Lauderdale
    4A Lawrence
    4A Lewis
    4A Lincoln
    4A Loudon
    4A Macon
    3A Madison
    4A Marion
    4A Marshall
    4A Maury
    4A McMinn
    3A McNairy
    4A Meigs
    4A Monroe
    4A Montgomery
    4A Moore
    4A Morgan
    4A Obion
    4A Overton
    4A Perry
    4A Pickett
    4A Polk
    4A Putnam
    4A Rhea
    4A Roane
    4A Robertson
    4A Rutherford
    4A Scott
    4A Sequatchie
    4A Sevier
    3A Shelby
    4A Smith
    4A Stewart
    4A Sullivan
    4A Sumner
    3A Tipton
    4A Trousdale
    4A Unicoi
    4A Union
    4A Van Buren
    4A Warren
    4A Washington
    4A Wayne
    4A Weakley
    4A White
    4A Williamson
    4A Wilson
    TEXAS
    2A Anderson*
    3B Andrews
    2A Angelina*
    2A Aransas*
    3A Archer
    4B Armstrong
    2A Atascosa*
    2A Austin*
    4B Bailey
    2B Bandera
    2A Bastrop*
    3B Baylor
    2A Bee*
    2A Bell*
    2A Bexar*
    3A Blanco*
    3B Borden
    2A Bosque*
    3A Bowie*
    2A Brazoria*
    2A Brazos*
    3B Brewster
    4B Briscoe
    2A Brooks*
    3A Brown*
    2A Burleson*
    3A Burnet*
    2A Caldwell*
    2A Calhoun*
    3B Callahan
    2A Cameron*
    3A Camp*
    4B Carson
    3A Cass*
    4B Castro
    2A Chambers*
    2A Cherokee*
    3B Childress
    3A Clay
    4B Cochran
    3B Coke
    3B Coleman
    3A Collin*
    3B Collingsworth
    2A Colorado*
    2A Comal*
    3A Comanche*
    3B Concho
    3A Cooke
    2A Coryell*
    3B Cottle
    3B Crane
    3B Crockett
    3B Crosby
    3B Culberson
    4B Dallam
    3A Dallas*
    3B Dawson
    4B Deaf Smith
    3A Delta
    3A Denton*
    2A DeWitt*
    3B Dickens
    2B Dimmit
    4B Donley
    2A Duval*
    3A Eastland
    3B Ector
    2B Edwards
    3A Ellis*
    3B El Paso
    3A Erath*
    2A Falls*
    3A Fannin
    2A Fayette*
    3B Fisher
    4B Floyd
    3B Foard
    2A Fort Bend*
    3A Franklin*
    2A Freestone*
    2B Frio
    3B Gaines
    2A Galveston*
    3B Garza
    3A Gillespie*
    3B Glasscock
    2A Goliad*
    2A Gonzales*
    4B Gray
    3A Grayson
    3A Gregg*
    2A Grimes*
    2A Guadalupe*
    4B Hale
    3B Hall
    3A Hamilton*
    4B Hansford
    3B Hardeman
    2A Hardin*
    2A Harris*
    3A Harrison*
    4B Hartley
    3B Haskell
    2A Hays*
    3B Hemphill
    3A Henderson*
    2A Hidalgo*
    2A Hill*
    4B Hockley
    3A Hood*
    3A Hopkins*
    2A Houston*
    3B Howard
    3B Hudspeth
    3A Hunt*
    4B Hutchinson
    3B Irion
    3A Jack
    2A Jackson*
    2A Jasper*
    3B Jeff Davis
    2A Jefferson*
    2A Jim Hogg*
    2A Jim Wells*
    3A Johnson*
    3B Jones
    2A Karnes*
    3A Kaufman*
    3A Kendall*
    2A Kenedy*
    3B Kent
    3B Kerr
    3B Kimble
    3B King
    2B Kinney
    2A Kleberg*
    3B Knox
    3A Lamar*
    4B Lamb
    3A Lampasas*
    2B La Salle
    2A Lavaca*
    2A Lee*
    2A Leon*
    2A Liberty*
    2A Limestone*
    4B Lipscomb
    2A Live Oak*
    3A Llano*
    3B Loving
    3B Lubbock
    3B Lynn
    2A Madison*
    3A Marion*
    3B Martin
    3B Mason
    2A Matagorda*
    2B Maverick
    3B McCulloch
    2A McLennan*
    2A McMullen*
    2B Medina
    3B Menard
    3B Midland
    2A Milam*
    3A Mills*
    3B Mitchell
    3A Montague
    2A Montgomery*
    4B Moore
    3A Morris*
    3B Motley
    3A Nacogdoches*
    3A Navarro*
    2A Newton*
    3B Nolan
    2A Nueces*
    4B Ochiltree
    4B Oldham
    2A Orange*
    3A Palo Pinto*
    3A Panola*
    3A Parker*
    4B Parmer
    3B Pecos
    2A Polk*
    4B Potter
    3B Presidio
    3A Rains*
    4B Randall
    3B Reagan
    2B Real
    3A Red River*
    3B Reeves
    2A Refugio*
    4B Roberts
    2A Robertson*
    3A Rockwall*
    3B Runnels
    3A Rusk*
    3A Sabine*
    3A San Augustine*
    2A San Jacinto*
    2A San Patricio*
    3A San Saba*
    3B Schleicher
    3B Scurry
    3B Shackelford
    3A Shelby*
    4B Sherman
    3A Smith*
    3A Somervell*
    2A Starr*
    3A Stephens
    3B Sterling
    3B Stonewall
    3B Sutton
    4B Swisher
    3A Tarrant*
    3B Taylor
    3B Terrell
    3B Terry
    3B Throckmorton
    3A Titus*
    3B Tom Green
    2A Travis*
    2A Trinity*
    2A Tyler*
    3A Upshur*
    3B Upton
    2B Uvalde
    2B Val Verde
    3A Van Zandt*
    2A Victoria*
    2A Walker*
    2A Waller*
    3B Ward
    2A Washington*
    2B Webb
    2A Wharton*
    3B Wheeler
    3A Wichita
    3B Wilbarger
    2A Willacy*
    2A Williamson*
    2A Wilson*
    3B Winkler
    3A Wise
    3A Wood*
    4B Yoakum
    3A Young
    2B Zapata
    2B Zavala
    UTAH
    5B Beaver
    6B Box Elder
    6B Cache
    6B Carbon
    6B Daggett
    5B Davis
    6B Duchesne
    5B Emery
    5B Garfield
    5B Grand
    5B Iron
    5B Juab
    5B Kane
    5B Millard
    6B Morgan
    5B Piute
    6B Rich
    5B Salt Lake
    5B San Juan
    5B Sanpete
    5B Sevier
    6B Summit
    5B Tooele
    6B Uintah
    5B Utah
    6B Wasatch
    3B Washington
    5B Wayne
    5B Weber
    VERMONT
    6A (all)
    VIRGINIA
    4A (all)
    WASHINGTON
    5B Adams
    5B Asotin
    5B Benton
    5B Chelan
    4C Clallam
    4C Clark
    5B Columbia
    4C Cowlitz
    5B Douglas
    6B Ferry
    5B Franklin
    5B Garfield
    5B Grant
    4C Grays Harbor
    4C Island
    4C Jefferson
    4C King
    4C Kitsap
    5B Kittitas
    5B Klickitat
    4C Lewis
    5B Lincoln
    4C Mason
    6B Okanogan
    4C Pacific
    6B Pend Oreille
    4C Pierce
    4C San Juan
    4C Skagit
    5B Skamania
    4C Snohomish
    5B Spokane
    6B Stevens
    4C Thurston
    4C Wahkiakum
    5B Walla Walla
    4C Whatcom
    5B Whitman
    5B Yakima
    WEST VIRGINIA
    5A Barbour
    4A Berkeley
    4A Boone
    4A Braxton
    5A Brooke
    4A Cabell
    4A Calhoun
    4A Clay
    5A Doddridge
    5A Fayette
    4A Gilmer
    5A Grant
    5A Greenbrier
    5A Hampshire
    5A Hancock
    5A Hardy
    5A Harrison
    4A Jackson
    4A Jefferson
    4A Kanawha
    5A Lewis
    4A Lincoln
    4A Logan
    5A Marion
    5A Marshall
    4A Mason
    4A McDowell
    4A Mercer
    5A Mineral
    4A Mingo
    5A Monongalia
    4A Monroe
    4A Morgan
    5A Nicholas
    5A Ohio
    5A Pendleton
    4A Pleasants
    5A Pocahontas
    5A Preston
    4A Putnam
    5A Raleigh
    5A Randolph
    4A Ritchie
    4A Roane
    5A Summers
    5A Taylor
    5A Tucker
    4A Tyler
    5A Upshur
    4A Wayne
    5A Webster
    5A Wetzel
    4A Wirt
    4A Wood
    4A Wyoming
    WISCONSIN
    6A Adams
    7 Ashland
    6A Barron
    7 Bayfield
    6A Brown
    6A Buffalo
    7 Burnett
    6A Calumet
    6A Chippewa
    6A Clark
    6A Columbia
    6A Crawford
    6A Dane
    6A Dodge
    6A Door
    7 Douglas
    6A Dunn
    6A Eau Claire
    7 Florence
    6A Fond du Lac
    7 Forest
    6A Grant
    6A Green
    6A Green Lake
    6A Iowa
    7 Iron
    6A Jackson
    6A Jefferson
    6A Juneau
    6A Kenosha
    6A Kewaunee
    6A La Crosse
    6A Lafayette
    7 Langlade
    7 Lincoln
    6A Manitowoc
    6A Marathon
    6A Marinette
    6A Marquette
    6A Menominee
    6A Milwaukee
    6A Monroe
    6A Oconto
    7 Oneida
    6A Outagamie
    6A Ozaukee
    6A Pepin
    6A Pierce
    6A Polk
    6A Portage
    7 Price
    6A Racine
    6A Richland
    6A Rock
    6A Rusk
    6A Sauk
    7 Sawyer
    6A Shawano
    6A Sheboygan
    6A St. Croix
    7 Taylor
    6A Trempealeau
    6A Vernon
    7 Vilas
    6A Walworth
    7 Washburn
    6A Washington
    6A Waukesha
    6A Waupaca
    6A Waushara
    6A Winnebago
    6A Wood
    WYOMING
    6B Albany
    6B Big Horn
    6B Campbell
    6B Carbon
    6B Converse
    6B Crook
    6B Fremont
    5B Goshen
    6B Hot Springs
    6B Johnson
    6B Laramie
    7 Lincoln
    6B Natrona
    6B Niobrara
    6B Park
    5B Platte
    6B Sheridan
    7 Sublette
    6B Sweetwater
    7 Teton
    6B Uinta
    6B Washakie
    6B Weston
    US TERRITORIES
    AMERICAN SAMOA
    1A (all)*
    GUAM
    1A (all)*
    NORTHERN MARIANA ISLANDS
    1A (all)*
    PUERTO RICO
    1A (all)*
    VIRGIN ISLANDS
    1A (all)*

    N1101.7.1 (R301.2) Warm humid counties.

    Warm humid counties are identified in Table N1101.7 by an asterisk.

    N1101.7.2 (R301.3) International climate zones.

    The climate zone for any location outside the United States shall be determined by applying Table N1101.7.2(1) and then Table N1101.7.2(2).

    TABLE N1101.7.2(1) [R302.3(1)]

    INTERNATIONAL CLIMATE ZONE DEFINITIONS

    MAJOR CLIMATE TYPE DEFINITIONS
    Marine (C) Definition—Locations meeting all four criteria:
    1. 1.Mean temperature of coldest month between -3°C (27°F) and 18°C (65°F).

    2. 2.Warmest month mean < 22°C (72°F).

    3. 3.At least four months with mean temperatures over 10°C (50°F).

    4. 4.Dry season in summer. The month with the heaviest precipitation in the cold season has at least three times as much precipitation as the month with the least precipitation in the rest of the year. The cold season is October through March in the Northern Hemisphere and April through September in the Southern Hemisphere.

    Dry (B) Definition—Locations meeting the following criteria:Not marine and Pin < 0.44 × (TF - 19.5)[Pcm < 2.0 × (TC + 7) in SI units]where:Pin = Annual precipitation in inches (cm)T = Annual mean temperature in °F (°C)
    Moist (A) Definition—Locations that are not marine and not dry.
    Warm-humid Definition—Moist (A) locations where either of the following wet-bulb temperature conditions shall occur during the warmest six consecutive months of the year:
    1. 1.67°F (19.4°C) or higher for 3,000 or more hours; or

    2. 2.73°F (22.8°C) or higher for 1,500 or more hours.

    For SI: °C = [(°F)-32]/1.8, 1 inch = 2.54 cm.

    TABLE N1101.7.2(2) [R301.3(2)]

    INTERNATIONAL CLIMATE ZONE DEFINITIONS

    ZONE NUMBERTHERMAL CRITERIA
    IP UnitsSI Units
    19000 < CDD50°F5000 < CDD10°C
    26300 < CDD50°F ≤ 90003500 < CDD10°C ≤ 5000
    3A and 3B4500 < CDD50°F ≤ 6300 AND HDD65°F ≤ 54002500 < CDD10°C ≤ 3500 AND HDD18°C ≤ 3000
    4A and 4BCDD50°F ≤ 4500 AND HDD65°F ≤ 5400CDD10°C ≤ 2500 AND HDD18°C ≤ 3000
    3CHDD65°F ≤ 3600HDD18°C ≤ 2000
    4C3600 < HDD65°F ≤ 54002000 < HDD18°C ≤ 3000
    55400 < HDD65°F ≤ 72003000 < HDD18°C ≤ 4000
    67200 < HDD65°F ≤ 90004000 < HDD18°C ≤ 5000
    79000 < HDD65°F ≤ 126005000 < HDD18°C ≤ 7000
    812600 < HDD65°F7000 < HDD18°C

    For SI: °C = [(°F)-32]/1.8.

    N1101.8 (R301.4) Tropical climate zone.

    The tropical climate zone shall be defined as:

    1. 1.Hawaii, Puerto Rico, Guam, American Samoa, US Virgin Islands, Commonwealth of Northern Mariana Islands; and

    2. 2.Islands in the area between the Tropic of Cancer and the Tropic of Capricorn.

    N1101.9 (R302.1) Interior design conditions.

    The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72°F (22°C) for heating and minimum of 75°F (24°C) for cooling.

    N1101.10 (R303.1) Identification.

    Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.

    N1101.10.1 (R303.1.1) Building thermal envelope insulation.

    An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For insulated siding, the R-value shall be labeled on the product’s package and shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.

    N1101.10.1.1 (R303.1.1.1) Blown or sprayed roof/ceiling insulation.

    The thickness of blown-in or sprayed roof/ceiling insulation (fiberglass or cellulose) shall be written in inches (mm) on markers that are installed at least one for every 300 square feet (28 m2) throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers not less than 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer.

    N1101.10.2 (R303.1.2) Insulation mark installation.

    Insulating materials shall be installed such that the manufacturer’s R-value mark is readily observable upon inspection.

    N1101.10.3 (R303.1.3) Fenestration product rating.

    U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100.

    Exception: Where required, garage door U-factors shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105.

    U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer.

    Products lacking such a labeled U-factor shall be assigned a default U-factor from Table N1101.10.3(1) or N1101.10.3(2). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table N1101.10.3(3).

    TABLE N1101.10.3(1) [R303.1.3(1)]

    DEFAULT GLAZED FENESTRATION U-FACTORS

    FRAME TYPESINGLE PANEDOUBLEPANESKYLIGHT
    SingleDouble
    Metal1.200.802.001.30
    Metal with Thermal Break1.100.651.901.10
    Nonmetal or Metal Clad0.950.551.751.05
    Glazed Block0.60

    TABLE N1101.10.3(2) [R303.1.3(2)]

    DEFAULT DOOR U-FACTORS

    DOOR TYPEU-FACTOR
    Uninsulated Metal1.20
    Insulated Metal0.60
    Wood0.50
    Insulated, nonmetal edge, max 45% glazing, any glazing double pane0.35

    TABLE N1101.10.3(3) [R303.1.3(3)]

    DEFAULT GLAZED FENESTRATION SHGC AND VT

    SINGLE GLAZEDDOUBLE GLAZEDGLAZED BLOCK
    ClearTintedClearTinted
    SHGC0.80.70.70.60.6
    VT0.60.30.60.30.6

    N1101.10.4 (R303.1.4) Insulation product rating.

    The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (CFR Title 16, Part 460) in units of h × ft2 × °F/Btu at a mean temperature of 75°F (24°C).

    N1101.10.4.1 (R303.1.4.1) Insulated siding.

    The thermal resistance (R-value) of insulated siding shall be determined in accordance with ASTM C 1363. Installation for testing shall be in accordance with the manufacturer’s installation instructions.

    N1101.11 (R303.2) Installation.

    All materials, systems and equipment shall be installed in accordance with the manufacturer’s instructions and this code.

    N1101.11.1 (R303.2.1) Protection of exposed foundation insulation.

    Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have a rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation’s thermal performance. The protective covering shall cover the exposed exterior insulation and extend not less than 6 inches (153 mm) below grade.

    N1101.12 (R303.3) Maintenance information.

    Maintenance instructions shall be furnished for equipment and systems that require preventive maintenance. Required regular maintenance actions shall be clearly stated and incorporated on a readily accessible label. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product.

    N1101.13 (R401.2) Compliance.

    Projects shall comply with one of the following:

    1. 1.Sections N1101.14 through N1104.

    2. 2.Section N1105 and the provisions of Sections N1101.14 through N1104 labeled “Mandatory.”

    3. 3.An energy rating index (ERI) approach in Section N1106.

    N1101.13.1 (R401.2.1) Tropical zone.

    Residential buildings in the tropical zone at elevations below 2,400 feet (731.5 m) above sea level shall be deemed to comply with this chapter where the following conditions are met:

    1. 1.Not more than one-half of the occupied space is air conditioned.

    2. 2.The occupied space is not heated.

    3. 3.Solar, wind or other renewable energy source supplies not less than 80 percent of the energy for service water heating.

    4. 4.Glazing in conditioned space has a solar heat gain coefficient of less than or equal to 0.40, or has an overhang with a projection factor equal to or greater than 0.30.

    5. 5.Permanently installed lighting is in accordance with Section N1104.

    6. 6.The exterior roof surface complies with one of the options in Table C402.2.1.1 of the International Energy Conservation Code, or the roof/ceiling has insulation with an R-value of R-15 or greater. If present, attics above the insulation are vented and attics below the insulation are unvented.

    7. 7.Roof surfaces have a minimum slope of 1/4 inch (6.4 mm) per foot of run. The finished roof does not have water accumulation areas.

    8. 8.Operable fenestration provides ventilation area equal to not less than 14 percent of the floor area in each room. Alternatively, equivalent ventilation is provided by a ventilation fan.

    9. 9.Bedrooms with exterior walls facing two different directions have operable fenestration on exterior walls facing two directions.

    10. 10.Interior doors to bedrooms are capable of being secured in the open position.

    11. 11.A ceiling fan or ceiling fan rough-in is provided for bedrooms and the largest space that is not used as a bedroom.

    N1101.14 (R401.3) Certificate (Mandatory).

    A permanent certificate shall be completed by the builder or registered design professional and posted on a wall in the space where the furnace is located, a utility room or an approved location inside the building. Where located on an electrical panel, the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label or other required labels. The certificate shall list the predominant R-values of insulation installed in or on ceiling/roof, walls, foundation (slab, basement wall, crawl space wall and/or floor) and ducts outside conditioned spaces; U-factors for fenestration and the solar heat gain coefficient (SHGC) of fenestration, and the results from any required duct system and building envelope air leakage testing done on the building. Where there is more than one value for each component, the certificate shall list the value covering the largest area. The certificate shall list the types and efficiencies of heating, cooling and service water heating equipment. Where a gas-fired unvented room heater, electric furnace, or baseboard electric heater is installed in the residence, the certificate shall list “gas-fired unvented room heater,” “electric furnace” or “baseboard electric heater,” as appropriate. An efficiency shall not be listed for gas-fired unvented room heaters, electric furnaces or electric baseboard heaters.

    SECTIONN1102 (R402)
    BUILDING THERMAL ENVELOPE

    N1102.1 (R402.1) General (Prescriptive).

    The building thermal envelope shall meet the requirements of Sections N1102.1.1 through N1102.1.5.

    Exception: The following low energy buildings, or portions thereof, separated from the remainder of the building by building thermal envelope assemblies complying with this section shall be exempt from the building thermal envelope provisions of Section N1102.

    1. 1.Those with a peak design rate of energy usage less than 3.4 Btu/h · ft2 (10.7 W/m2) or 1.0 watt/ft2 of floor area for space conditioning purposes.

    2. 2.Those that do not contain conditioned space.

    N1102.1.1 (R402.1.1) Vapor retarder.

    Wall assemblies in the building thermal envelope shall comply with the vapor retarder requirements of Section R702.7.

    N1102.1.2 (R402.1.2) Insulation and fenestration criteria.

    The building thermal envelope shall meet the requirements of Table N1102.1.2 based on the climate zone specified in Section N1101.7.

    TABLE N1102.1.2 (R402.1.2)

    INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa

    CLIMATE ZONEFENESTRATION U-FACTORbSKYLIGHTbU-FACTORGLAZED FENESTRATION SHGCb,eCEILING R-VALUEWOOD FRAME WALL R-VALUEMASS WALL R-VALUEiFLOOR R-VALUEBASEMENTc WALL R-VALUESLABdR-VALUE & DEPTHCRAWL SPACEc WALLR-VALUE
    1NR0.750.2530133/413000
    20.400.650.2538134/613000
    30.350.550.253820 or 13 + 5h8/13195/13f05/13
    4 except Marine0.350.550.404920 or 13 + 5h8/131910/1310, 2 ft10/13
    5 and Marine 40.320.55NR4920 or 13 + 5h13/1730g15/1910, 2 ft15/19
    60.320.55NR4920 + 5 or 13 + 10h15/2030g15/1910, 4 ft15/19
    7 and 80.320.55NR4920 + 5 or 13 + 10h19/2138g15/1910, 4 ft15/19

    For SI: 1 foot = 304.8 mm.

    1. a.R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the installed R-value of the insulation shall not be less than the R-value specified in the table.

    2. b.The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration.

      Exception: Skylights may be excluded from glazed fenestration SHGC requirements in Climate Zones 1 through 3 where the SHGC for such skylights does not exceed 0.30.

    3. c.“15/19” means R-15 continuous insulation on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. “15/19” shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the home. “10/13” means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.

    4. d.R-5 shall be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or 2 feet, whichever is less in Zones 1 through 3 for heated slabs.

    5. e.There are no SHGC requirements in the Marine Zone.

    6. f.Basement wall insulation is not required in warm-humid locations as defined by Figure N1101.10 and Table N1101.10.

    7. g.Or insulation sufficient to fill the framing cavity, R-19 minimum.

    8. h.The first value is cavity insulation, the second value is continuous insulation, so “13+5” means R-13 cavity insulation plus R-5 continuous insulation.

    9. i.The second R-value applies when more than half the insulation is on the interior of the mass wall.

    N1102.1.3 (R402.1.3) R-value computation.

    Insulation material used in layers, such as framing cavity insulation, or continuous insulation shall be summed to compute the corresponding component R-value. The manufacturer’s settled R-value shall be used for blown insulation. Computed R-values shall not include an R-value for other building materials or air films. Where insulated siding is used for the purpose of complying with the continuous insulation requirements of Table N1102.1.2, the manufacturer’s labeled R-value for insulated siding shall be reduced by R-0.6.

    N1102.1.4 (R402.1.4) U-factor alternative.

    An assembly with a U-factor equal to or less than that specified in Table N1102.1.4 shall be permitted as an alternative to the R-value in Table N1102.1.2.

    TABLE N1102.1.4 (R402.1.4)

    EQUIVALENT U-FACTORSa

    CLIMATEZONEFENESTRATIONU-FACTORSKYLIGHT U-FACTORCEILING U-FACTORFRAME WALL U-FACTORMASS WALL U-FACTORbFLOOR U-FACTORBASEMENT WALL U-FACTORCRAWL SPACE WALL U-FACTOR
    10.500.750.0350.0840.1970.0640.3600.477
    20.400.650.0300.0840.1650.0640.3600.477
    30.350.550.0300.0600.0980.0470.091c0.136
    4 except Marine0.350.550.0260.0600.0980.0470.0590.065
    5 and Marine 40.320.550.0260.0600.0820.0330.0500.055
    60.320.550.0260.0450.0600.0330.0500.055
    7 and 80.320.550.0260.0450.0570.0280.0500.055
    1. a.Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source.

    2. b.When more than half the insulation is on the interior, the mass wall U-factors shall be a maximum of 0.17 in Zone 1, 0.14 in Zone 2, 0.12 in Zone 3, 0.087 in Zone 4 except Marine, 0.065 in Zone 5 and Marine 4, and 0.057 in Zones 6 through 8.

    3. c.Basement wall U-factor of 0.360 in warm-humid locations as defined by Figure N1101.10 (R301.1) and Table N1101.10 (R301.1).

    N1102.1.5 (R402.1.5) Total UA alternative.

    If the total building thermal envelope UA (sum of U-factor times assembly area) is less than or equal to the total UA resulting from using the U-factors in Table N1102.1.4 (multiplied by the same assembly area as in the proposed building), the building shall be considered in compliance with Table N1102.1.2. The UA calculation shall be done using a method consistent with the ASHRAE Handbook of Fundamentals and shall include the thermal bridging effects of framing materials. The SHGC requirements shall be met in addition to UA compliance.

    N1102.2 (R402.2) Specific insulation requirements (Prescriptive).

    In addition to the requirements of Section N1102.1, insulation shall meet the specific requirements of Sections N1102.2.1 through N1102.2.13.

    N1102.2.1 (R402.2.1) Ceilings with attic spaces.

    Where Section R1102.1.2 would require R-38 insulation in the ceiling, installing R-30 over 100 percent of the ceiling area requiring insulation shall be deemed to satisfy the requirement for R-38 wherever the full height of uncompressed R-30 insulation extends over the wall top plate at the eaves. Similarly, where Section R1102.1.2 would require R-49 insulation in the ceiling, installing R-38 over 100 percent of the ceiling area requiring insulation shall be deemed to satisfy the requirement for R-49 insulation wherever the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves. This reduction shall not apply to the U-factor alternative approach in Section R1102.1.4 and the total UA alternative in Section R1102.1.5.

    N1102.2.2 (R402.2.2) Ceilings without attic spaces.

    Where Section N1102.1.2 would require insulation levels above R-30 and the design of the roof/ceiling assembly does not allow sufficient space for the required insulation, the minimum required insulation for such roof/ceiling assemblies shall be R-30. This reduction of insulation from the requirements of Section N1102.1.2 shall be limited to 500 square feet (46 m2) or 20 percent of the total insulated ceiling area, whichever is less. This reduction shall not apply to the U-factor alternative approach in Section N1102.1.4 and the total UA alternative in Section N1102.1.5.

    N1102.2.3 (R402.2.3) Eave baffle.

    For air-permeable insulations in vented attics, a baffle shall be installed adjacent to soffit and eave vents. Baffles shall maintain an opening equal or greater than the size of the vent. The baffle shall extend over the top of the attic insulation. The baffle shall be permitted to be any solid material.

    N1102.2.4 (R402.2.4) Access hatches and doors.

    Access doors from conditioned spaces to unconditioned spaces such as attics and crawl spaces shall be weatherstripped and insulated to a level equivalent to the insulation on the surrounding surfaces. Access shall be provided to all equipment that prevents damaging or compressing the insulation. A wood-framed or equivalent baffle or retainer is required to be provided when loose-fill insulation is installed, the purpose of which is to prevent the loose-fill insulation from spilling into the living space when the attic access is opened, and to provide a permanent means of maintaining the installed R-value of the loose-fill insulation.

    Exception: Vertical doors that provide access from conditioned to unconditioned spaces shall be permitted to meet the fenestration requirements of Table R1102.1.2 based on the applicable climate zone specified in Chapter 3.

    N1102.2.5 (R402.2.5) Mass walls.

    Mass walls for the purposes of this chapter shall be considered above-grade walls of concrete block, concrete, insulated concrete form (ICF), masonry cavity, brick (other than brick veneer), earth (adobe, compressed earth block, rammed earth) and solid timber/logs, or any other walls having a heat capacity greater than or equal to 6 Btu/ft2 × °F (123 kJ/m2 × K).

    N1102.2.6 (R402.2.6) Steel-frame ceilings, walls, and floors.

    Steel-frame ceilings, walls, and floors shall meet the insulation requirements of Table N1102.2.6 or shall meet the U-factor requirements of Table N1102.1.4. The calculation of the U-factor for a steel-frame envelope assembly shall use a series-parallel path calculation method.

    TABLE N1102.2.6 (R402.2.6)

    STEEL-FRAME CEILING, WALL AND FLOOR INSULATION (R-VALUE)

    WOOD FRAME R-VALUE REQUIREMENTCOLD-FORMED STEEL EQUIVALENT R-VALUEa
    Steel Truss Ceilingsb
    R-30R-38 or R-30 + 3 or R-26 + 5
    R-38R-49 or R-38 + 3
    R-49R-38 + 5
    Steel Joist Ceilingsb
    R-30R-38 in 2 × 4 or 2 × 6 or 2 × 8 R-49 in any framing
    R-38R-49 in 2 × 4 or 2 × 6 or 2 × 8 or 2 × 10
    Steel-Framed Wall, 16″ on center
    R-13R-13 + 4.2 or R-19 + 2.1 or R-21 + 2.8 or R-0 + 9.3 or R-15 + 3.8 or R-21 + 3.1
    R-13 + 3R-0 + 11.2 or R-13 + 6.1 or R-15 + 5.7 or R-19 + 5.0 or R-21 + 4.7
    R-20R-0 + 14.0 or R-13 + 8.9 or R-15 + 8.5 or R-19 + 7.8 or R-19 + 6.2 or R-21 + 7.5
    R-20 + 5R-13 + 12.7 or R-15 + 12.3 or R-19 + 11.6 or R-21 + 11.3 or R-25 + 10.9
    R-21R-0 + 14.6 or R-13 + 9.5 or R-15 + 9.1 or R-19 + 8.4 or R-21 + 8.1 or R-25 + 7.7
    Steel-Framed Wall, 24″ on center
    R-13R-0 + 9.3 or R-13 + 3.0 or R-15 + 2.4
    R-13 + 3R-0 + 11.2 or R-13 + 4.9 or R-15 + 4.3 or R-19 + 3.5 or R-21 + 3.1
    R-20R-0 + 14.0 or R-13 + 7.7 or R-15 + 7.1 or R-19 + 6.3 or R-21 + 5.9
    R-20 + 5R-13 + 11.5 or R-15 + 10.9 or R-19 + 10.1 or R-21 + 9.7 or R-25 + 9.1
    R-21R-0 + 14.6 or R-13 + 8.3 or R-15 + 7.7 or R-19 + 6.9 or R-21 + 6.5 or R-25 + 5.9
    Steel Joist Floor
    R-13R-19 in 2 × 6, or R-19 + 6 in 2 × 8 or 2 × 10
    R-19R-19 + 6 in 2 × 6, or R-19 + 12 in 2 × 8 or 2 × 10
    1. a.Cavity insulation R-value is listed first, followed by continuous insulation R-value.

    2. b.Insulation exceeding the height of the framing shall cover the framing.

    N1102.2.7 (R402.2.7) Walls with partial structural sheathing.

    Where Section R1102.1.2 would require continuous insulation on exterior walls and structural sheathing covers 40 percent or less of the gross area of all exterior walls, the continuous insulation R-value shall be permitted to be reduced by an amount necessary to result in a consistent total sheathing thickness, but not more than R-3, on areas of the walls covered by structural sheathing. This reduction shall not apply to the U-factor alternative approach in Section R1102.1.4 and the total UA alternative in Section R1102.1.5.

    N1102.2.8 (R402.2.8) Floors.

    Floor framing-cavity insulation shall be installed to maintain permanent contact with the underside of the subfloor decking.

    Exception: The floor framing-cavity insulation shall be permitted to be in contact with the topside of sheathing or continuous insulation installed on the bottom side of floor framing where combined with insulation that meets or exceeds the minimum wood frame wall R-value in Table 1102.1.2 and that extends from the bottom to the top of all perimeter floor framing members.

    N1102.2.9 (R402.2.9) Basement walls.

    Walls associated with conditioned basements shall be insulated from the top of the basement wall down to 10 feet (3048 mm) below grade or to the basement floor, whichever is less. Walls associated with unconditioned basements shall meet this requirement unless the floor overhead is insulated in accordance with Sections N1102.1.2 and N1102.2.8.

    N1102.2.10 (R402.2.10) Slab-on-grade floors.

    Slab-on-grade floors with a floor surface less than 12 inches (305 mm) below grade shall be insulated in accordance with Table N1102.1.2. The insulation shall extend downward from the top of the slab on the outside or inside of the foundation wall. Insulation located below grade shall be extended the distance provided in Table N1102.1.2 by any combination of vertical insulation, insulation extending under the slab or insulation extending out from the building. Insulation extending away from the building shall be protected by pavement or by not less than 10 inches (254 mm) of soil. The top edge of the insulation installed between the exterior wall and the edge of the interior slab shall be permitted to be cut at a 45-degree (0.79 rad) angle away from the exterior wall. Slab-edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation.

    N1102.2.11 (R402.2.11) Crawl space walls.

    As an alternative to insulating floors over crawl spaces, crawl space walls shall be permitted to be insulated when the crawl space is not vented to the outside. Crawl space wall insulation shall be permanently fastened to the wall and extend downward from the floor to the finished grade level and then vertically and/or horizontally for at least an additional 24 inches (610 mm). Exposed earth in unvented crawl space foundations shall be covered with a continuous Class I vapor retarder in accordance with this code. All joints of the vapor retarder shall overlap by 6 inches (153 mm) and be sealed or taped. The edges of the vapor retarder shall extend not less than 6 inches (153 mm) up the stem wall and shall be attached to the stem wall.

    N1102.2.12 (R402.2.12) Masonry veneer.

    Insulation shall not be required on the horizontal portion of the foundation that supports a masonry veneer.

    N1102.2.13 (R402.2.13) Sunroom insulation.

    Sunrooms enclosing conditioned spaces shall meet the insulation requirements of this code.

    Exception: For sunrooms with thermal isolation, and enclosing conditioned spaces, the following exceptions to the insulation requirements of this code shall apply:

    1. 1.The minimum ceiling insulation R-values shall be R-19 in Zones 1 through 4 and R-24 in Zones 5 through 8.

    2. 2.The minimum wall R-value shall be R-13 in all climate zones. Walls separating a sunroom with a thermal isolation from conditioned space shall meet the building thermal envelope requirements of this code.

    N1102.3 (R402.3) Fenestration (Prescriptive).

    In addition to the requirements of Section N1102, fenestration shall comply with Sections N1102.3.1 through N1102.3.5.

    N1102.3.1 (R402.3.1) U-factor.

    An area-weighted average of fenestration products shall be permitted to satisfy the U-factor requirements.

    N1102.3.2 (R402.3.2) Glazed fenestration SHGC.

    An area-weighted average of fenestration products more than 50-percent glazed shall be permitted to satisfy the SHGC requirements.

    Dynamic glazing shall be permitted to satisfy the SHGC requirements of Table R1102.1.2 provided the ratio of the higher to lower labeled SHGC is greater than or equal to 2.4, and the dynamic glazing is automatically controlled to modulate the amount of solar gain into the space in multiple steps. Dynamic glazing shall be considered separately from other fenestration, and area-weighted averaging with other fenestration that is not dynamic glazing shall not be permitted.

    Exception: Dynamic glazing is not required to comply with this section when both the lower and higher labeled SHGC already comply with the requirements of Table N1102.1.2.

    N1102.3.3 (R402.3.3) Glazed fenestration exemption.

    Up to 15 square feet (1.4 m2) of glazed fenestration per dwelling unit shall be permitted to be exempt from U-factor and SHGC requirements in Section N1102.1.2. This exemption shall not apply to the U-factor alternative approach in Section N1102.1.4 and the total UA alternative in Section N1102.1.5.

    N1102.3.4 (R402.3.4) Opaque door exemption.

    One side-hinged opaque door assembly up to 24 square feet (2.22 m2) in area is exempted from the U-factor requirement in Section N1102.1.2. This exemption shall not apply to the U-factor alternative approach in Section N1102.1.4 and the total UA alternative in Section N1102.1.5.

    N1102.3.5 (R402.3.5) Sunroom fenestration.

    Sunrooms enclosing conditioned space shall meet the fenestration requirements of this code.

    Exception: For sunrooms with thermal isolation and enclosing conditioned space in Climate Zones 2 through 8, the maximum fenestration U-factor shall be 0.45 and the maximum skylight U-factor shall be 0.70.

    New fenestration separating the sunroom with thermal isolation from conditioned space shall meet the building thermal envelope requirements of this code.

    N1102.4 (R402.4) Air leakage (Mandatory).

    The building thermal envelope shall be constructed to limit air leakage in accordance with the requirements of Sections N1102.4.1 through N1102.4.5.

    N1102.4.1 (R402.4.1) Building thermal envelope.

    The building thermal envelope shall comply with Sections N1102.4.1.1 and N1102.4.1.2. The sealing methods between dissimilar materials shall allow for differential expansion and contraction.

    N1102.4.1.1 (R402.4.1.1) Installation.

    The components of the building thermal envelope as listed in Table N1102.4.1.1 shall be installed in accordance with the manufacturer’s instructions and the criteria listed in Table N1102.4.1.1, as applicable to the method of construction. Where required by the building official, an approved third party shall inspect all components and verify compliance.

    TABLE N1102.4.1.1 (402.4.1.1)

    AIR BARRIER AND INSULATION INSTALLATION

    COMPONENTAIR BARRIER CRITERIAINSULATION INSTALLATION CRITERIA
    General requirementsA continuous air barrier shall be installed in the building envelope.The exterior thermal envelope contains a continuous air barrier.Breaks or joints in the air barrier shall be sealed.Air-permeable insulation shall not be used as a sealing material.
    Ceiling/atticThe air barrier in any dropped ceiling/soffit shall be aligned with the insulation and any gaps in the air barrier sealed.Access openings, drop down stairs or knee wall doors to unconditioned attic spaces shall be sealed.The insulation in any dropped ceiling/soffit shall be aligned with the air barrier.
    WallsThe junction of the foundation and sill plate shall be sealed.The junction of the top plate and the top of exterior walls shall be sealed.Knee walls shall be sealed.Cavities within corners and headers of frame walls shall be insulated by completely filling the cavity with a material having a thermal resistance of R-3 per inch minimum.Exterior thermal envelope insulation for framed walls shall be installed in substantial contact and continuous alignment with the air barrier.
    Windows, skylights and doorsThe space between window/door jambs and framing, and skylights and framing shall be sealed.
    Rim joistsRim joists shall include the air barrier.Rim joists shall be insulated.
    Floors (including above garage and cantilevered floors)The air barrier shall be installed at any exposed edge of insulation.Floor framing cavity insulation shall be installed to maintain permanent contact with the underside of subfloor decking, or floor framing cavity insulation shall be permitted to be in contact with the top side of sheathing, or continuous insulation installed on the underside of floor framing; and extends from the bottom to the top of all perimeter floor framing members.
    Crawl space wallsExposed earth in unvented crawl spaces shall be covered with a Class I vapor retarder with overlapping joints taped.Where provided instead of floor insulation, insulation shall be permanently attached to the crawl space walls.
    Shafts, penetrationsDuct shafts, utility penetrations, and flue shafts opening to exterior or unconditioned space shall be sealed.
    Narrow cavitiesBatts in narrow cavities shall be cut to fit, or narrow cavities shall be filled by insulation that on installation readily conforms to the available cavity space.
    Garage separationAir sealing shall be provided between the garage and conditioned spaces.
    Recessed lightingRecessed light fixtures installed in the building thermal envelope shall be sealed to the dry wall.Recessed light fixtures installed in the building thermal envelope shall be air tight and IC rated.
    Plumbing and wiringBatt insulation shall be cut neatly to fit around wiring and plumbing in exterior walls, or insulation that on installation readily conforms to available space shall extend behind piping and wiring.
    Shower/tub on exterior wallThe air barrier installed at exterior walls adjacent to showers and tubs shall separate them from the showers and tubs.Exterior walls adjacent to showers and tubs shall be insulated.
    Electrical/phone box on exterior wallsThe air barrier shall be installed behind electrical or communication boxes or air-sealed boxes shall be installed.
    HVAC register bootsHVAC register boots that penetrate building thermal envelope shall be sealed to the subfloor or drywall.
    Concealed sprinklersWhen required to be sealed, concealed fire sprinklers shall only be sealed in a manner that is recommended by the manufacturer. Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings.
    1. a.In addition, inspection of log walls shall be in accordance with the provisions of ICC 400.

    N1102.4.1.2 (R402.4.1.2) Testing.

    The building or dwelling unit shall be tested and verified as having an air leakage rate of not exceeding five air changes per hour in Climate Zones 1 and 2, and three air changes per hour in Climate Zones 3 through 8. Testing shall be conducted in accordance with ASTM E 779 or ASTM E 1827 and reported at a pressure of 0.2 inches w.g. (50 Pascals). Where required by the code official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope.

    During testing:

    1. 1.Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, beyond the intended weatherstripping or other infiltration control measures.

    2. 2.Dampers including exhaust, intake, makeup air, backdraft and flue dampers shall be closed, but not sealed beyond intended infiltration control measures.

    3. 3.Interior doors, if installed at the time of the test, shall be open.

    4. 4.Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed.

    5. 5.Heating and cooling systems, if installed at the time of the test, shall be turned off.

    6. 6.Supply and return registers, if installed at the time of the test, shall be fully open.

    N1102.4.2 (R402.4.2) Fireplaces.

    New wood-burning fireplaces shall have tight-fitting flue dampers or doors, and outdoor combustion air. Where using tight-fitting doors on factory-built fireplaces listed and labeled in accordance with UL 127, the doors shall be tested and listed for the fireplace. Where using tight-fitting doors on masonry fireplaces, the doors shall be listed and labeled in accordance with UL 907.

    N1102.4.3 (R402.4.3) Fenestration air leakage.

    Windows, skylights and sliding glass doors shall have an air infiltration rate of no more than 0.3 cfm per square foot (1.5 L/s/m2), and swinging doors no more than 0.5 cfm per square foot (2.6 L/s/m2), when tested according to NFRC 400 or AAMA/WDMA/CSA 101/I.S.2/A440 by an accredited, independent laboratory and listed and labeled by the manufacturer.

    Exception: Site-built windows, skylights and doors.

    N1102.4.4 (R402.4.4) Rooms containing fuel-burning appliances.

    In Climate Zones 3 through 8, where open combustion air ducts provide combustion air to open combustion fuel-burning appliances, the appliances and combustion air opening shall be located outside the building thermal envelope or enclosed in a room, isolated from inside the thermal envelope. Such rooms shall be sealed and insulated in accordance with the envelope requirements of Table N1102.1.2, where the walls, floors and ceilings shall meet a minimum of the basement wall R-value requirement. The door into the room shall be fully gasketed and any water lines and ducts in the room insulated in accordance with Section N1103. The combustion air duct shall be insulated where it passes through conditioned space to a minimum of R-8.

    Exceptions:

    1. 1.Direct vent appliances with both intake and exhaust pipes installed continuous to the outside.

    2. 2.Fireplaces and stoves complying with Sections N1102.4.2 and R1006.

    N1102.4.5 (R402.4.5) Recessed lighting.

    Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be IC-rated and labeled as having an air leakage rate not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. All recessed luminaires shall be sealed with a gasket or caulk between the housing and the interior wall or ceiling covering.

    N1102.5 (R402.5) Maximum fenestration U-factor and SHGC (Mandatory).

    The area-weighted average maximum fenestration U-factor permitted using tradeoffs from Section N1102.1.5 or N1105 shall be 0.48 in Climate Zones 4 and 5 and 0.40 in Climate Zones 6 through 8 for vertical fenestration, and 0.75 in Climate Zones 4 through 8 for skylights. The area-weighted average maximum fenestration SHGC permitted using tradeoffs from Section N1105 in Climate Zones 1 through 3 shall be 0.50.

    SECTIONN1103 (R403)
    SYSTEMS

    N1103.1 (R403.1) Controls (Mandatory).

    At least one thermostat shall be provided for each separate heating and cooling system.

    N1103.1.1 (R403.1.1) Programmable thermostat.

    The thermostat controlling the primary heating or cooling system of the dwelling unit shall be capable of controlling the heating and cooling system on a daily schedule to maintain different temperature set points at different times of the day. This thermostat shall include the capability to set back or temporarily operate the system to maintain zone temperatures down to 55°F (13°C) or up to 85°F (29°C). The thermostat shall initially be programmed by the manufacturer with a heating temperature set point no higher than 70°F (21°C) and a cooling temperature set point no lower than 78°F (26°C).

    N1103.1.2 (R403.1.2) Heat pump supplementary heat (Mandatory).

    Heat pumps having supplementary electric-resistance heat shall have controls that, except during defrost, prevent supplemental heat operation when the heat pump compressor can meet the heating load.

    N1103.2 (R403.2) Hot water boiler outdoor temperature setback.

    Hot water boilers that supply heat to the building through one- or two-pipe heating systems shall have an outdoor setback control that lowers the boiler water temperature based on the outdoor temperature.

    N1103.3 (R403.3) Ducts.

    Ducts and air handlers shall be in accordance with Sections N1103.3.1 through N1103.3.5.

    N1103.3.1 (R403.3.1) Insulation (Prescriptive).

    Supply and return ducts in attics shall be insulated to a minimum of R-8 where 3 inches (76.2 mm) in diameter and greater and R-6 where less than 3 inches (76.2 mm) in diameter. Supply and return ducts in other portions of the building shall be insulated to a minimum of R-6 where 3 inches (76.2 mm) in diameter or greater and R-4.2 where less than 3 inches (76.2 mm) in diameter.

    Exception: Ducts or portions thereof located completely inside the building thermal envelope.

    N1103.3.2 (R403.3.2) Sealing (Mandatory).

    Ducts, air handlers and filter boxes shall be sealed. Joints and seams shall comply with either the International Mechanical Code or Section M1601.4.1 of this code, as applicable.

    Exceptions:

    1. 1.Air-impermeable spray foam products shall be permitted to be applied without additional joint seals.

    2. 2.For ducts having a static pressure classification of less than 2 inches of water column (500 Pa), additional closure systems shall not be required for continuously welded joints and seams, and locking-type joints and seams of other than the snap-lock and button-lock types.

    N1103.3.2.1 (R403.3.2.1) Sealed air handler.

    Air handlers shall have a manufacturer’s designation for an air leakage of no more than 2 percent of the design air flow rate when tested in accordance with ASHRAE 193.

    N1103.3.3 (R403.3.3) Duct testing (Mandatory).

    Ducts shall be pressure tested to determine air leakage by one of the following methods:

    1. 1.Rough-in test: Total leakage shall be measured with a pressure differential of 0.1 inch w.g. (25 Pa) across the system, including the manufacturer’s air handler enclosure if installed at the time of the test. All registers shall be taped or otherwise sealed during the test.

    2. 2.Postconstruction test: Total leakage shall be measured with a pressure differential of 0.1 inch w.g. (25 Pa) across the entire system, including the manufacturer’s air handler enclosure. Registers shall be taped or otherwise sealed during the test.

    Exception: A duct air leakage test shall not be required where the ducts and air handlers are located entirely within the building thermal envelope.

    A written report of the results of the test shall be signed by the party conducting the test and provided to the code official.

    N1103.3.4 (R403.3.4) Duct leakage (Prescriptive).

    The total leakage of the ducts, where measured in accordance with Section R403.3.3, shall be as follows:

    1. 1.Rough-in test: The total leakage shall be less than or equal to 4 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area where the air handler is installed at the time of the test. Where the air handler is not installed at the time of the test, the total leakage shall be less than or equal to 3 cubic feet per minute (85 L/min) per 100 square feet (9.29 m2) of conditioned floor area.

    2. 2.Postconstruction test: Total leakage shall be less than or equal to 4 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area.

    N1103.3.5 (R403.3.5) Building cavities (Mandatory).

    Building framing cavities shall not be used as ducts or plenums.

    N1103.4 (R403.4) Mechanical system piping insulation (Mandatory).

    Mechanical system piping capable of carrying fluids above 105°F (41°C) or below 55°F (13°C) shall be insulated to a minimum of R-3.

    N1103.4.1 (R403.4.1) Protection of piping insulation.

    Piping insulation exposed to weather shall be protected from damage, including that caused by sunlight, moisture, equipment maintenance and wind, and shall provide shielding from solar radiation that can cause degradation of the material. Adhesive tape shall not be permitted.

    N1103.5 (R403.5) Service hot water systems.

    Energy conservation measures for service hot water systems shall be in accordance with Sections N1103.5.1 through N1103.5.4.

    N1103.5.1 (R403.5.1) Heated water circulation and temperature maintenance systems (Mandatory).

    Heated water circulation systems shall be in accordance with Section R1103.5.1.1. Heat trace temperature maintenance systems shall be in accordance with Section R1103.5.1.2. Automatic controls, temperature sensors and pumps shall be accessible. Manual controls shall be readily accessible.

    N1103.5.1.1 (R403.5.1.1) Circulation systems.

    Heated water circulation systems shall be provided with a circulation pump. The system return pipe shall be a dedicated return pipe or a cold water supply pipe. Gravity and thermo-syphon circulation systems shall be prohibited. Controls for circulating hot water system pumps shall start the pump based on the identification of a demand for hot water within the occupancy. The controls shall automatically turn off the pump when the water in the circulation loop is at the desired temperature and when there is no demand for hot water.

    N1103.5.1.2 (R403.5.1.2) Heat trace systems.

    Electric heat trace systems shall comply with IEEE 515.1 or UL 515. Controls for such systems shall automatically adjust the energy input to the heat tracing to maintain the desired water temperature in the piping in accordance with the times when heated water is used in the occupancy.

    N1103.5.2 (R403.5.2) Demand recirculation systems.

    A water distribution system having one or more recirculation pumps that pump water from a heated water supply pipe back to the heated water source through a cold water supply pipe shall be a demand recirculation water system. Pumps shall have controls that comply with both of the following:

    1. 1.The control shall start the pump upon receiving a signal from the action of a user of a fixture or appliance, sensing the presence of a user of a fixture or sensing the flow of hot or tempered water to a fixture fitting or appliance.

    2. 2.The control shall limit the temperature of the water entering the cold water piping to 104ºF (40ºC).

    N1103.5.3 (R403.5.3) Hot water pipe insulation (Prescriptive).

    Insulation for hot water pipe with a minimum thermal resistance (R-value) of R-3 shall be applied to the following:

    1. 1.Piping 3/4 inch (19 mm) and larger in nominal diameter.

    2. 2.Piping serving more than one dwelling unit.

    3. 3.Piping located outside the conditioned space.

    4. 4.Piping from the water heater to a distribution manifold.

    5. 5.Piping located under a floor slab.

    6. 6.Buried piping.

    7. 7.Supply and return piping in recirculation systems other than demand recirculation systems.

    N1103.5.4 (R403.5.4) Drain water heat recovery units.

    Drain water heat recovery units shall comply with CSA 55.2. Drain water heat recovery units shall be tested in accordance with CSA 55.1. Potable water-side pressure loss of drain water heat recovery units shall be less than 3 psi (20.7 kPa) for individual units connected to one or two showers. Potable water-side pressure loss of drain water heat recovery units shall be less than 2 psi (13.8 kPa) for individual units connected to three or more showers.

    N1103.6 (R403.6) Mechanical ventilation (Mandatory).

    The building shall be provided with ventilation that meets the requirements of Section M1507 of this code or the International Mechanical Code, as applicable, or with other approved means of ventilation. Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating.

    N1103.6.1 (R403.6.1) Whole-house mechanical ventilation system fan efficacy.

    Mechanical ventilation system fans shall meet the efficacy requirements of Table N1103.6.1.

    Exception: Where mechanical ventilation fans are integral to tested and listed HVAC equipment, they shall be powered by an electronically commutated motor.

    TABLE N1103.6.1 (R403.6.1)

    MECHANICAL VENTILATION SYSTEM FAN EFFICACY

    FAN LOCATIONAIR FLOW RATE MINIMUM (CFM)MINIMUM EFFICACY (CFM/WATT)AIR FLOW RATE MAXIMUM (CFM)
    Range hoodsAny2.8 cfm/wattAny
    In-line fanAny2.8 cfm/wattAny
    Bathroom, utility room101.4 cfm/watt< 90
    Bathroom, utility room902.8 cfm/wattAny

    For SI: 1 cubic foot per minute = 28.3 L/min.

    N1103.7 (R403.7) Equipment sizing and efficiency rating (Mandatory).

    Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies. New or replacement heating and cooling equipment shall have an efficiency rating equal to or greater than the minimum required by federal law for the geographic location where the equipment is installed.

    N1103.8 (R403.8) Systems serving multiple dwelling units (Mandatory).

    Systems serving multiple dwelling units shall comply with Sections C403 and C404 of the IECC—Commercial Provisions in lieu of Section N1103.

    N1103.9 (R403.9) Snow melt system controls (Mandatory).

    Snow- and ice-melting systems, supplied through energy service to the building, shall include automatic controls capable of shutting off the system when the pavement temperature is above 50°F (10°C), and no precipitation is falling and an automatic or manual control that will allow shutoff when the outdoor temperature is above 40°F (4.8°C).

    N1103.10 (R403.10) Pools and permanent spa energy consumption (Mandatory).

    The energy consumption of pools and permanent spas shall be in accordance with Sections N1103.10.1 through N1103.10.3.

    N1103.10.1 (R403.10.1) Heaters.

    The electric power to heaters shall be controlled by a readily accessible on-off switch that is an integral part of the heater mounted on the exterior of the heater, or external to and within 3 feet (914 mm) of the heater. Operation of such switch shall not change the setting of the heater thermostat. Such switches shall be in addition to a circuit breaker for the power to the heater. Gas-fired heaters shall not be equipped with continuously burning ignition pilots.

    N403.10.2 (R403.10.2) Time switches.

    Time switches or other control methods that can automatically turn off and on according to a preset schedule shall be installed for heaters and pump motors. Heaters and pump motors that have built-in time switches shall be in compliance with this section.

    Exceptions:

    1. 1.Where public health standards require 24-hour pump operation.

    2. 2.Pumps that operate solar- and waste-heat-recovery pool heating systems.

    N1103.10.3 (R403.10.3) Covers.

    Outdoor heated pools and outdoor permanent spas shall be provided with a vapor-retardant cover or other approved vapor-retardant means.

    Exception: Where more than 70 percent of the energy for heating, computed over an operation season, is from site-recovered energy, such as from a heat pump or solar energy source, covers or other vapor-retardant means shall not be required.

    N1103.11 (R403.11) Portable spas (Mandatory).

    The energy consumption of electric-powered portable spas shall be controlled by the requirements of APSP-14.

    N1103.12 (R403.12) Residential pools and permanent residential spas.

    Residential swimming pools and permanent residential spas that are accessory to detached one- and two-family dwellings and townhouses 3 stories or less in height above grade plane and that are available only to the household and its guests shall be in accordance with APSP-15.

    SECTIONN1104 (R404)
    ELECTRICAL POWER AND LIGHTING SYSTEMS
    (MANDATORY)

    N1104.1 (R404.1) Lighting equipment (Mandatory).

    Not less than 75 percent of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps or not less than 75 percent of the permanently installed lighting fixtures shall contain only high-efficacy lamps.

    Exception: Low-voltage lighting.

    N1104.1.1 (R404.1.1) Lighting equipment (Mandatory).

    Fuel gas lighting systems shall not have continuously burning pilot lights.

    SECTIONN1105 (R405)
    SIMULATED PERFORMANCE ALTERNATIVE
    (PERFORMANCE)

    N1105.1 (R405.1) Scope.

    This section establishes criteria for compliance using simulated energy performance analysis. Such analysis shall include heating, cooling and service water heating energy only.

    N1105.2 (R405.2) Mandatory requirements.

    Compliance with this section requires that the mandatory provisions identified in Section N1101.13 be met. All supply and return ducts not completely inside the building thermal envelope shall be insulated to a minimum of R-6.

    N1105.3 (R405.3) Performance-based compliance.

    Compliance based on simulated energy performance requires that a proposed residence (proposed design) be shown to have an annual energy cost that is less than or equal to the annual energy cost of the standard reference design. Energy prices shall be taken from a source approved by the building official, such as the Department of Energy, Energy Information Administration’s State Energy Price and Expenditure Report. Building officials shall be permitted to require time-of-use pricing in energy cost calculations.

    Exception: The energy use based on source energy expressed in Btu (J) or Btu per square foot (J/m2) of conditioned floor area shall be permitted to be substituted for the energy cost. The source energy multiplier for electricity shall be 3.16. The source energy multiplier for fuels other than electricity shall be 1.1.

    N1105.4 (R405.4) Documentation.

    Documentation of the software used for the performance design and the parameters for the building shall be in accordance with Sections N1105.4.1 through N1105.4.3.

    N1105.4.1 (R405.4.1) Compliance software tools.

    Documentation verifying that the methods and accuracy of the compliance software tools conform to the provisions of this section shall be provided to the building official.

    N1105.4.2 (R405.4.2) Compliance report.

    Compliance software tools shall generate a report that documents that the proposed design complies with Section N1105.3. A compliance report on the proposed design shall be submitted with the application for the building permit. Upon completion of the building, a compliance report based on the as-built condition of the building shall be submitted to the code official before a certificate of occupancy is issued. Batch sampling of buildings to determine energy code compliance for all buildings in the batch shall be prohibited.

    Compliance reports shall include information in accordance with Sections N1105.4.2.1 and N1105.4.2.2. Where the proposed design of a building could be built on different sites where the cardinal orientation of the building on each site is different, compliance of the proposed design for the purposes of the application for the building permit shall be based on the worst-case orientation, worst-case configuration, worst-case building air leakage and worst-case duct leakage. Such worst-case parameters shall be used as inputs to the compliance software for energy analysis.

    N1105.4.2.1 (R405.4.2.1) Compliance report for permit application.

    A compliance report submitted with the application for building permit shall include the following:

    1. 1.Building street address, or other building site identification.

    2. 2.A statement indicating that the proposed design complies with Section N1105.3.

    3. 3.An inspection checklist documenting the building component characteristics of the proposed design as indicated in Table N1105.5.2(1). The inspection checklist shall show results for both the standard reference design and the proposed design with user inputs to the compliance software to generate the results.

    4. 4.A site-specific energy analysis report that is in compliance with Section N1105.3.

    5. 5.The name of the individual performing the analysis and generating the report.

    6. 6.The name and version of the compliance software tool.

    N1105.4.2.2 (R405.4.2.2) Compliance report for certificate of occupancy.

    A compliance report submitted for obtaining the certificate of occupancy shall include the following:

    1. 1.Building street address, or other building site identification.

    2. 2.A statement indicating that the as-built building complies with Section N1105.3.

    3. 3.A certificate indicating that the building passes the performance matrix for code compliance and listing the energy saving features of the buildings.

    4. 4.A site-specific energy analysis report that is in compliance with Section N1105.3.

    5. 5.The name of the individual performing the analysis and generating the report.

    6. 6.The name and version of the compliance software tool.

    N1105.4.3 (R405.4.3) Additional documentation.

    The building official shall be permitted to require the following documents:

    1. 1.Documentation of the building component characteristics of the standard reference design.

    2. 2.A certification signed by the builder providing the building component characteristics of the proposed design as given in Table N1105.5.2(1).

    3. 3.Documentation of the actual values used in the software calculations for the proposed design.

    N1105.5 (R405.5) Calculation procedure.

    Calculations of the performance design shall be in accordance with Sections N1105.5.1 and N1105.5.2.

    N1105.5.1 (R405.5.1) General.

    Except as specified by this section, the standard reference design and proposed design shall be configured and analyzed using identical methods and techniques.

    N1105.5.2 (R405.5.2) Residence specifications.

    The standard reference design and proposed design shall be configured and analyzed as specified by Table N1105.5.2(1). Table N1105.5.2(1) shall include, by reference, all notes contained in Table N1102.1.2.

    TABLE N1105.5.2(1) [R405.5.2(1)]

    SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED DESIGNS

    BUILDING COMPONENTSTANDARD REFERENCE DESIGNPROPOSED DESIGN
    Above-grade wallsType: mass wall if proposed wall is mass; otherwise wood frame.As proposed
    Gross area: same as proposedAs proposed
    U-factor: as specified in Table N1102.1.4As proposed
    Solar absorptance = 0.75As proposed
    Emittance = 0.90As proposed
    Basement and crawlspace wallsType: same as proposedAs proposed
    Gross area: same as proposedAs proposed
    U-factor: from Table N1102.1.4, with insulation layer on interior side of wallsAs proposed
    Above-grade floorsType: wood frameAs proposed
    Gross area: same as proposedAs proposed
    U-factor: as specified in Table N1102.1.4As proposed
    CeilingsType: wood frameAs proposed
    Gross area: same as proposedAs proposed
    U-factor: as specified in Table N1102.1.4As proposed
    RoofsType: composition shingle on wood sheathingAs proposed
    Gross area: same as proposedAs proposed
    Solar absorptance = 0.75As proposed
    Emittance = 0.90As proposed
    AtticsType: vented with aperture = 1 ft2 per 300 ft2 ceiling areaAs proposed
    FoundationsType: same as proposedAs proposed
    Foundation wall area above and below grade and soil characteristics: same asproposedAs proposed
    Opaque doorsArea: 40 ft2As proposed
    Orientation: NorthAs proposed
    U-factor: same as fenestration from Table N1102.1.4As proposed
    Vertical fenestrationother than opaquedoorsTotal areah =(a) The proposed glazing area, where the proposed glazing area is less than 15 percent of the conditioned floor area(b) 15 percent of the conditioned floor area, where the proposed glazing area is 15 percent or more of the conditioned floor areaAs proposed
    Orientation: equally distributed to four cardinal compass orientations (N, E, S & W).As proposed
    U-factor: as specified in Table N1102.1.4As proposed
    SHGC: as specified in Table N1102.1.2 except that for climates with no requirement (NR) SHGC = 0.40 shall be used.As proposed
    Interior shade fraction: 0.92-(0.21 × SHGC for the standard reference design)0.92-(0.21 × SHGC as proposed)
    External shading: noneAs proposed
    SkylightsNoneAs proposed
    Thermally isolatedsunroomsNoneAs proposed
    Air exchange rateAir leakage rate of 5 air changes per hour in Climate Zones 1 and 2, and 3 air changes per hour in Climate Zones 3 through 8 at a pressure of 0.2 inches w.g (50 Pa). The mechanical ventilation rate shall be in addition to the air leakage rate and the same as in the proposed design, but no greater than 0.01 × CFA + 7.5 × (Nbr + 1)where:CFA = conditioned floor areaNbr = number of bedroomsEnergy recovery shall not be assumed for mechanical ventilation.For residences that are not tested, the same air leakage rate as the standard reference design.For tested residences, the measured air exchange ratea.The mechanical ventilation rateb shall be in addition to the air leakage rate and shall be as proposed.
    Mechanical ventilationNone, except where mechanical ventilation is specified by the proposed design, in which case:Annual vent fan energy use:kWh/yr = 0.03942 × CFA + 29.565 × (Nbr + 1)where:CFA = conditioned floor areaNbr = number of bedroomsAs proposed
    Internal gainsIGain = 17,900 + 23.8 × CFA + 4104 × Nbr (Btu/day per dwelling unit)Same as standard reference design.
    Internal massAn internal mass for furniture and contents of 8 pounds per square foot of floor area.Same as standard reference design, plus any additional mass specifically designed as a thermal storage elementc but not integral to the building envelope or structure.
    Structural massFor masonry floor slabs, 80 percent of floor area covered by R-2 carpet and pad, and 20 percent of floor directly exposed to room air.As proposed
    For masonry basement walls, as proposed, but with insulation required byTable R402.1.4 located on the interior side of the wallsAs proposed
    For other walls, for ceilings, floors, and interior walls, wood frame constructionAs proposed
    Heating systemsd, eAs proposed for other than electric heating without a heat pump, where the proposed design utilizes electric heating without a heat pump the standard reference design shall be an air source heat pump meeting the requirements of Section C403. of the IECC-Commercial Provisions.Capacity: sized in accordance with Section N1103.7As proposed
    Cooling systemsd, fAs proposedCapacity: sized in accordance with Section N1103.7.As proposed
    Service water heatingd, e, fAs proposedUse: same as proposed designAs proposedgal/day = 30 + (10 × Nbr)
    Thermal distributionsystemsDuct insulation: From Section N1103.2.1A thermal distribution system efficiency (DSE) of 0.88 shall be applied to both the heating and cooling system efficiencies for all systems other than tested duct systems. For tested duct systems, the leakage rate shall be 4 cfm (113.3 L/min) per 100 ft2 (9.29 m2) of conditioned floor area at a pressure of differential of 0.1 inches w.g. (25 Pa).As tested or as specified in Table R405.5.2(2) if not tested. Duct insulation shall be as proposed.
    ThermostatType: Manual, cooling temperature setpoint = 75°F;Heating temperature setpoint = 72°FSame as standard reference

    For SI: 1 square foot = 0.93 m2, 1 British thermal unit = 1055 J, 1 pound per square foot = 4.88 kg/m2, 1 gallon (US) = 3.785 L, °C = (°F-32)/1.8, 1 degree = 0.79 rad.

    1. a.Where required by the code official, testing shall be conducted by an approved party. Hourly calculations as specified in the ASHRAE Handbook of Fundamentals, or the equivalent shall be used to determine the energy loads resulting from infiltration.

    2. b.The combined air exchange rate for infiltration and mechanical ventilation shall be determined in accordance with Equation 43 of 2001 ASHRAE Handbook of Fundamentals, page 26.24 and the “Whole-house Ventilation” provisions of 2001 ASHRAE Handbook of Fundamentals, page 26.19 for intermittent mechanical ventilation.

    3. c.Thermal storage element shall mean a component not part of the floors, walls or ceilings that is part of a passive solar system, and that provides thermal storage such as enclosed water columns, rock beds, or phase-change containers. A thermal storage element must be in the same room as fenestration that faces within 15 degrees (0.26 rad) of true south, or must be connected to such a room with pipes or ducts that allow the element to be actively charged.

    4. d.For a proposed design with multiple heating, cooling or water heating systems using different fuel types, the applicable standard reference design system capacities and fuel types shall be weighted in accordance with their respective loads as calculated by accepted engineering practice for each equipment and fuel type present.

    5. e.For a proposed design without a proposed heating system, a heating system with the prevailing federal minimum efficiency shall be assumed for both the standard reference design and proposed design.

    6. f.For a proposed design home without a proposed cooling system, an electric air conditioner with the prevailing federal minimum efficiency shall be assumed for both the standard reference design and the proposed design.

    7. g.For a proposed design with a nonstorage-type water heater, a 40-gallon storage-type water heater with the prevailing federal minimum energy factor for the same fuel as the predominant heating fuel type shall be assumed. For the case of a proposed design without a proposed water heater, a 40-gallon storage-type water heater with the prevailing federal minimum efficiency for the same fuel as the predominant heating fuel type shall be assumed for both the proposed design and standard reference design.

    8. h.For residences with conditioned basements, R-2 and R-4 residences and townhouses, the following formula shall be used to determine glazing area:

      Eq0003.jpg

      where:

      AF = Total glazing area.
      As = Standard reference design total glazing area.
      FA = (Above-grade thermal boundary gross wall area)/(above-grade boundary wall area + 0.5 × below-grade boundary wall area).
      F = (Above-grade thermal boundary wall area)/(above-grade thermal boundary wall area + common wall area) or 0.56, whichever is greater.

      and where:

      Thermal boundary wall is any wall that separates conditioned space from unconditioned space or ambient conditions.

      Above-grade thermal boundary wall is any thermal boundary wall component not in contact with soil.

      Below-grade boundary wall is any thermal boundary wall in soil contact.

      Common wall area is the area of walls shared with an adjoining dwelling unit.

      L and CFA are in the same units.

    TABLE N1105.5.2(2) [R405.5.2(2)]

    DEFAULT DISTRIBUTION SYSTEM EFFICIENCIES FOR PROPOSED DESIGNSa

    DISTRIBUTION SYSTEM CONFIGURATION AND CONDITIONFORCED AIR SYSTEMSHYDRONIC SYSTEMSb
    Distribution system components located in unconditioned space0.95
    Untested distribution systems entirely located in conditioned spacec0.881
    “Ductless” systemsd1

    For SI: 1 cubic foot per minute = 0.47 L/s, 1 square foot = 0.093m2, 1 pound per square inch = 6895 Pa, 1 inch water gauge = 1250 Pa.

    1. a.Default values given by this table are for untested distribution systems, which must still meet minimum requirements for duct system insulation.

    2. b.Hydronic systems shall mean those systems that distribute heating and cooling energy directly to individual spaces using liquids pumped through closed-loop piping and that do not depend on ducted, forced airflow to maintain space temperatures.

    3. c.Entire system in conditioned space shall mean that no component of the distribution system, including the air handler unit, is located outside of the conditioned space.

    4. d.Ductless systems shall be allowed to have forced airflow across a coil but shall not have any ducted airflow external to the manufacturer’s air handler enclosure.

    N1105.6 (R405.6) Calculation software tools.

    Calculation software, where used, shall be in accordance with Sections N1105.6.1 through N1105.6.3.

    N1105.6.1 (R405.6.1) Minimum capabilities.

    Calculation procedures used to comply with this section shall be software tools capable of calculating the annual energy consumption of all building elements that differ between the standard reference design and the proposed design and shall include the following capabilities:

    1. 1.Computer generation of the standard reference design using only the input for the proposed design. The calculation procedure shall not allow the user to directly modify the building component characteristics of the standard reference design.

    2. 2.Calculation of whole-building (as a single zone) sizing for the heating and cooling equipment in the standard reference design residence in accordance with Section N1103.6.

    3. 3.Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating and air-conditioning equipment based on climate and equipment sizing.

    4. 4.Printed building official inspection checklist listing each of the proposed design component characteristics from Table N1105.5.2(1) determined by the analysis to provide compliance, along with their respective performance ratings (R-value, U-factor, SHGC, HSPF, AFUE, SEER, EF are some examples).

    N1105.6.2 (R405.6.2) Specific approval.

    Performance analysis tools meeting the applicable provisions of Section N1105 shall be permitted to be approved. Tools are permitted to be approved based on meeting a specified threshold for a jurisdiction. The building official shall be permitted to approve tools for a specified application or limited scope.

    N1105.6.3 (R405.6.3) Input values.

    When calculations require input values not specified by Sections N1102, N1103, N1104 and N1105, those input values shall be taken from an approved source.

    SECTIONN1106 (R406)
    ENERGY RATING INDEX
    COMPLIANCE ALTERNATIVE

    N1106.1 (R406.1) Scope.

    This section establishes criteria for compliance using an Energy Rating Index (ERI) analysis.

    N1106.2 (R406.2) Mandatory requirements.

    Compliance with this section requires that the mandatory provisions identified in Sections N1101.13 through N1104 identified as “mandatory” and Section N1103.5.3 be met. The building thermal envelope shall be greater than or equal to levels of efficiency and Solar Heat Gain Coefficient in Table 402.1.1 or 402.1.3 of the 2009 International Energy Conservation Code.

    Exception: Supply and return ducts not completely inside the building thermal envelope shall be insulated to a minimum of R-6.

    N1106.3 (R406.3) Energy rating index.

    The Energy Rating Index (ERI) shall be a numerical integer value that is based on a linear scale constructed such that the ERI reference design has an Index value of 100 and a residential building that uses no net purchased energy has an Index value of 0. Each integer value on the scale shall represent a 1 percent change in the total energy use of the rated design relative to the total energy use of the ERI reference design. The ERI shall consider all energy used in the residential building.

    N1106.3.1 (R406.3.1) ERI reference design.

    The ERI reference design shall be configured such that it meets the minimum requirements of the 2006 International Energy Conservation Code prescriptive requirements.

    The proposed residential building shall be shown to have an annual total normalized modified load less than or equal to the annual total loads of the ERI reference design.

    N1106.4 (R406.4) ERI-based compliance.

    Compliance based on an ERI analysis requires that the rated design be shown to have an ERI less than or equal to the appropriate value listed in Table N1106.4 when compared to the ERI reference design.

    TABLE N1106.4 (R406.4)

    MAXIMUM ENERGY RATING INDEX

    CLIMATE ZONEENERGY RATING INDEX
    152
    252
    351
    454
    555
    654
    753
    853

    N1106.5 (R406.5) Verification by approved agency.

    Verification of compliance with Section N1106 shall be completed by an approved third party.

    N1106.6 (R406.6) Documentation.

    Documentation of the software used to determine the ERI and the parameters for the residential building shall be in accordance with Sections N1106.6.1 through N1106.6.3.

    N1106.6.1 (R406.6.1) Compliance software tools.

    Documentation verifying that the methods and accuracy of the compliance software tools conform to the provisions of this section shall be provided to the code official.

    N1106.6.2 (R406.6.2) Compliance report.

    Compliance software tools shall generate a report that documents that the ERI of the rated design complies with Sections N1106.3 and N1106.4. The compliance documentation shall include the following information:

    1. 1.Address or other identification of the residential building.

    2. 2.An inspection checklist documenting the building component characteristics of the rated design. The inspection checklist shall show results for both the ERI reference design and the rated design, and shall document all inputs entered by the user necessary to reproduce the results.

    3. 3.Name of individual completing the compliance report.

    4. 4.Name and version of the compliance software tool.

    Exception: Multiple orientations. Where an otherwise identical building model is offered in multiple orientations, compliance for any orientation shall be permitted by documenting that the building meets the performance requirements in each of the four (north, east, south and west) cardinal orientations.

    N1106.6.3 (R406.6.3) Additional documentation.

    The code official shall be permitted to require the following documents:

    1. 1.Documentation of the building component characteristics of the ERI reference design.

    2. 2.A certification signed by the builder providing the building component characteristics of the rated design.

    3. 3.Documentation of the actual values used in the software calculations for the rated design.

    N1106.7 (R406.7) Calculation software tools.

    Calculation software, where used, shall be in accordance with Sections N1106.7.1 through N1106.7.3.

    N1106.7.1 R(406.7.1) Minimum capabilities.

    Calculation procedures used to comply with this section shall be software tools capable of calculating the ERI as described in Section N1106.3, and shall include the following capabilities:

    1. 1.Computer generation of the ERI reference design using only the input for the rated design.

      The calculation procedure shall not allow the user to directly modify the building component characteristics of the ERI reference design.

    2. 2.Calculation of whole-building, as a single zone, sizing for the heating and cooling equipment in the ERI reference design residence in accordance with Section N1103.7.

    3. 3.Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating and air-conditioning equipment based on climate and equipment sizing.

    4. 4.Printed code official inspection checklist listing each of the rated design component characteristics determined by the analysis to provide compliance, along with their respective performance ratings.

    N1106.7.2 (406.7.2) Specific approval.

    Performance analysis tools meeting the applicable sections of Section N1106 shall be approved. Tools are permitted to be approved based on meeting a specified threshold for a jurisdiction. The code official shall approve tools for a specified application or limited scope.

    N1106.7.3 (R406.7.3) Input values.

    When calculations require input values not specified by Sections N1102, N1103, N1104 and N1105, those input values shall be taken from an approved source.

    SECTIONN1107 (R501)
    EXISTING BUILDINGS—GENERAL

    N1107.1 (R501.1) Scope.

    The provisions of Sections N1107 through N1111 shall control the alteration, repair, addition and change of occupancy of existing buildings and structures.

    N1107.1.1 (R501.1.1) Additions, alterations, or repairs: General.

    Additions, alterations, or repairs to an existing building, building system or portion thereof shall comply with Section N1108, N1109 or N1110. Unaltered portions of the existing building or building supply system shall not be required to comply with this chapter.

    N1107.2 (R501.2) Existing buildings.

    Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code.

    N1107.3 (R501.3) Maintenance.

    Buildings and structures, and parts thereof, shall be maintained in a safe and sanitary condition. Devices and systems that are required by this code shall be maintained in conformance with the code edition under which installed. The owner or the owner’s authorized agent shall be responsible for the maintenance of buildings and structures. The requirements of this chapter shall not provide the basis for removal or abrogation of energy conservation, fire protection and safety systems and devices in existing structures.

    N1107.4 (R501.4) Compliance.

    Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in this code and the International Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, International Plumbing Code, International Property Maintenance Code, International Private Sewage Disposal Code and NFPA 70.

    N1107.5 (R501.5) New and replacement materials.

    Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs, provided no hazard to life, health or property is created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.

    N1107.6 (R501.6) Historic buildings.

    No provision of this chapter relating to the construction, repair, alteration, restoration and movement of structures, and change of occupancy shall be mandatory for historic buildings provided a report has been submitted to the code official and signed by the owner, a registered design professional, or a representative of the State Historic Preservation Office or the historic preservation authority having jurisdiction, demonstrating that compliance with that provision would threaten, degrade or destroy the historic form, fabric or function of the building.

    SECTIONN1108 (R502)
    ADDITIONS

    N1108.1 (R502.1) General.

    Additions to an existing building, building system or portion thereof shall conform to the provisions of this chapter as they relate to new construction without requiring the unaltered portion of the existing building or building system to comply with this chapter. Additions shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this chapter where the addition alone complies, where the existing building and addition comply with this chapter as a single building, or where the building with the addition uses no more energy than the existing building. Additions shall be in accordance with Section N1108.1.1 or N1108.1.2.

    N1108.1.1 (R502.1.1) Prescriptive compliance.

    Additions shall comply with Sections N1108.1.1.1 through N1108.1.1.4.

    N1108.1.1.1 (R502.1.1.1) Building envelope.

    New building envelope assemblies that are part of the addition shall comply with Sections N1102.1, N1102.2, N1102.3.1 through N1102.3.5, and N1102.4.

    Exception: Where nonconditioned space is changed to conditioned space, the building envelope of the addition shall comply where the UA, as determined in Section N1102.1.5, of the existing building and the addition, and any alterations that are part of the project, is less than or equal to UA generated for the existing building.

    N1108.1.1.2 (R502.1.1.2) Heating and cooling systems.

    New heating, cooling and duct systems that are part of the addition shall comply with Sections N1103.1, N1103.2, N1103.3, N1103.5 and N1103.6.

    Exception: Where ducts from an existing heating and cooling system are extended to an addition, duct systems with less than 40 linear feet (12.19 m) in unconditioned spaces shall not be required to be tested in accordance with Section N1103.2.2.

    N1108.1.1.3 (R502.1.1.3) Service hot water systems.

    New service hot water systems that are part of the addition shall comply with Section N1103.4.

    N1108.1.1.4 (R502.1.1.4) Lighting.

    New lighting systems that are part of the addition shall comply with Section N1104.1.

    N1108.1.2 (R502.1.2) Existing plus addition compliance (Simulated Performance Alternative).

    Where nonconditioned space is changed to conditioned space, the addition shall comply where the annual energy cost or energy use of the addition and the existing building, and any alterations that are part of the project, is less than or equal to the annual energy cost of the existing building when modeled in accordance with Section N1105. The addition and any alterations that are part of the project shall comply with Section N1105 in its entirety.

    SECTIONN1109 (R503)
    ALTERATIONS

    N1109.1 (R503.1) General.

    Alterations to any building or structure shall comply with the requirements of the code for new construction. Alterations shall be such that the existing building or structure is no less conforming with the provisions of this chapter than the existing building or structure was prior to the alteration.

    Alterations to an existing building, building system or portion thereof shall conform to the provisions of this chapter as they relate to new construction without requiring the unaltered portions of the existing building or building system to comply with this chapter. Alterations shall not create an unsafe or hazardous condition or overload existing building systems. Alterations shall be such that the existing building or structure uses no more energy than the existing building or structure prior to the alteration. Alterations to existing buildings shall comply with Sections N1109.1.1 through N1109.2.

    N1109.1.1 (R503.1.1) Building envelope.

    Building envelope assemblies that are part of the alteration shall comply with Section N1102.1.2 or N1102.1.4, Sections N1102.2.1 through N1102.2.12, N1102.3.1, N1102.3.2, N1102.4.3 and N1102.4.5.

    Exception: The following alterations need not comply with the requirements for new construction provided the energy use of the building is not increased:

    1. 1.Storm windows installed over existing fenestration.

    2. 2.Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are filled with insulation.

    3. 3.Construction where the existing roof, wall or floor cavity is not exposed.

    4. 4.Roof recover.

    5. 5.Roofs without insulation in the cavity and where the sheathing or insulation is exposed during reroofing shall be insulated either above or below the sheathing.

    6. 6.Surface applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain provided the code does not require the glazing or fenestration assembly to be replaced.

    N1109.1.1.1 (R503.1.1.1) Replacement fenestration.

    Where some or all of an existing fenestration unit is replaced with a new fenestration product, including sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC as provided in Table N1102.1.2.

    N1109.1.2 (R503.1.2) Heating and cooling systems.

    New heating, cooling and duct systems that are part of the alteration shall comply with Sections N1103.1, N1103.2, N1103.3 and N1103.6.

    Exception: Where ducts from an existing heating and cooling system are extended, duct systems with less than 40 linear feet (12.19 m) in unconditioned spaces shall not be required to be tested in accordance with Section N1103.3.3.

    N1109.1.3 (R503.1.3) Service hot water systems.

    New service hot water systems that are part of the alteration shall comply with Section N1103.5.

    N1109.1.4 (R503.1.4) Lighting.

    New lighting systems that are part of the alteration shall comply with Section N1104.1.

    Exception: Alterations that replace less than 50 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power.

    N1109.2 (R503.2) Change in space conditioning.

    Any non-conditioned or low energy space that is altered to become conditioned space shall be required to be brought into full compliance with this chapter.

    Exception: Where the simulated performance option in Section N1105 is used to comply with this section, the annual energy cost of the proposed design is permitted to be 110 percent of the annual energy cost otherwise allowed by Section N1105.3.

    SECTIONN1110 (R504)
    REPAIRS

    N1110.1 (R504.1) General.

    Buildings, structures and parts thereof shall be repaired in compliance with Section N1107.3 and this section. Work on nondamaged components necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to the requirements for alterations in this chapter. Routine maintenance required by Section N1107.3, ordinary repairs exempt from permit, and abatement of wear due to normal service conditions shall not be subject to the requirements for repairs in this section.

    N1110.2 (R504.2) Application.

    For the purposes of this code, the following shall be considered repairs:

    1. 1.Glass-only replacements in an existing sash and frame.

    2. 2.Roof repairs.

    3. 3.Repairs where only the bulb and/or ballast within the existing luminaires in a space are replaced provided that the replacement does not increase the installed interior lighting power.

    SECTIONN1111 (R505)
    CHANGE OF OCCUPANCY OR USE

    N1111.1 (R505.1) General.

    Spaces undergoing a change in occupancy that would result in an increase in demand for either fossil fuel or electrical energy shall comply with this code.

    N1111.2 (R505.2) General.

    Any space that is converted to a dwelling unit or portion thereof from another use or occupancy shall comply with this code.

    Exception: Where the simulated performance option in Section N1105 is used to comply with this section, the annual energy cost of the proposed design is permitted to be 110 percent of the annual energy cost otherwise allowed by Section N1105.3.