Figure R301.1 Climate Zones.
CLIMATE ZONES, MOISTURE REGIMES AND WARM-HUMID DESIGNATIONS BY COUNTY
|Key: A – Moist Asterisk (*) indicates a warm-humid location.|
|2A Indian River*|
|1A Palm Beach*|
|2A Santa Rosa*|
|2A St. Johns*|
|2A St. Lucie*|
Warm humid counties are identified in Table R301.1 by an asterisk.
INTERNATIONAL CLIMATE ZONE DEFINITIONS
|MAJOR CLIMATE TYPE DEFINITIONS|
|Marine (C) Definition—Locations meeting all four criteria:
|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:
For SI: °C = [(°F)-32]/1.8, 1 inch = 2.54 cm.
INTERNATIONAL CLIMATE ZONE DEFINITIONS
|ZONE NUMBER||THERMAL CRITERIA|
|IP Units||SI Units|
|1||9000 < CDD50°F||5000 < CDD10°C|
|2||6300 < CDD50°F ≤ 9000||3500 < CDD10°C ≤ 5000|
|3A and 3B||4500 < CDD50°F ≤ 6300 AND HDD65°F ≤ 5400||2500 < CDD10°C ≤ 3500 AND HDD18°C ≤ 3000|
|4A and 4B||CDD50°F ≤ 4500 AND HDD65°F ≤ 5400||CDD10°C ≤ 2500 AND HDD18°C ≤ 3000|
|3C||HDD65°F ≤ 3600||HDD18°C ≤ 2000|
|4C||3600 < HDD65°F ≤ 5400||2000 < HDD18°C ≤ 3000|
|5||5400 < HDD65°F ≤ 7200||3000 < HDD18°C ≤ 4000|
|6||7200 < HDD65°F ≤ 9000||4000 < HDD18°C ≤ 5000|
|7||9000 < HDD65°F ≤ 12600||5000 < HDD18°C ≤ 7000|
|8||12600 < HDD65°F||7000 < HDD18°C|
For SI: °C = [(°F)-32]/1.8.
The tropical climate zone shall be defined as:
1.Hawaii, Puerto Rico, Guam, American Samoa, U.S. Virgin Islands, Commonwealth of Northern Mariana Islands; and
2.Islands in the area between the Tropic of Cancer and the Tropic of Capricorn.
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.
Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.
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).
R-values referenced in Chapter 4 of this code refer to the R-values of the added insulation only. The R-values of structural building materials such as framing members, concrete blocks or gypsum board shall not be included.
Exception: R402.1.5 Total UA Alternative.
When installing two layers of bulk or board insulation, the R-values of each material may be added together for a total R-value. When installing two separate reflective insulation products in layers, the total R-value of the system shall have been achieved by testing under FTC regulations, 16 CFR Part 460.
The thermal resistance (R-value) of insulated siding shall be determined in accordance with ASTM C1363. Installation for testing shall be in accordance with the manufacturer’s instructions.
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 sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and R-value of installed thickness 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.
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.
Insulating materials shall be installed such that the manufacturer’s R-value mark is readily observable upon inspection.
Minimum equipment efficiency rating identification for heating, cooling, hot water, swimming pool heating and filtration, and lighting shall be in accordance with industry standards and as described in Chapter 4 of the Commercial Provisions of this code, as applicable, for such equipment.
U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100.
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 R303.1.3(1) or R303.1.3(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 R303.1.3(3).
DEFAULT GLAZED FENESTRATION U-FACTORS
|FRAME TYPE||SINGLE PANE||DOUBLE PANE||SKYLIGHT|
|Metal with Thermal Break||1.10||0.65||1.90||1.10|
|Nonmetal or Metal Clad||0.95||0.55||1.75||1.05|
DEFAULT DOOR U-FACTORS
|Insulated, nonmetal edge, max 45% glazing, any glazing double pane||0.35|
DEFAULT GLAZED FENESTRATION SHGC AND VT
|SINGLE GLAZED||DOUBLE GLAZED||GLAZED BLOCK|
Insulation materials shall comply with the requirements of their respective ASTM standard specification and shall be installed in accordance with their respective ASTM installation practice in Table R303.2.1 in such a manner as to achieve rated R-value of insulation. Open-blown or poured loose-fill insulation shall not be used in attic roof spaces when the slope of the ceiling is more than 3 in 12. When eave vents are installed, baffling of the vent openings shall be provided to deflect the incoming air above the surface of the insulation.
Exception: Where metal building roof and metal building wall insulation is compressed between the roof or wall skin and the structure.
INSULATION INSTALLATION STANDARDS
|INSULATION MATERIAL||STANDARD SPECIFICATION||INSTALLATION PRACTICE|
|Mineral Fiber Batt/Blanket||ASTM C665||ASTM C1320|
|Mineral Fiber Loose Fill||ASTM C764||ASTM C1015|
|Cellulose Loose Fill||ASTM C739||ASTM C1015|
|Polystyrene Foam||ASTM C578||—|
|Polyisocyanurate Foam||ASTM C1289||—|
|Reflective||ASTM C1224||ASTM C727|
|Radiant Barrier||ASTM C1313||ASTM C1158|
|Spray-applied Rigid Cellular Polyurethane Foam||ASTM C1029||—|
|Interior Radiation Control Coating Systems||—||ASTM C1321|
Insulation that has been compressed to 85 percent or less of the manufacturer’s rated thickness for the product shall use the R-values given in Table 303.2.1.1. These values are to be used except where data developed by an independent testing laboratory are provided.
R-VALUES OF COMPRESSED INSULATION
|% OF ORIGINAL THICKNESS||R-5||R-7||R-11||R-14||R-19||R-30||R-38|
Insulation shall be installed in a permanent manner in substantial contact with the inside surface in accordance with manufacturer’s recommendations for the framing system used. Flexible batt insulation installed in floor cavities shall be supported in a permanent manner by supports no greater than 24 inches (610 mm) on center (o.c.).
Exception: Insulation materials that rely on airspaces adjacent to reflective surfaces for their rated performance.
Exterior insulation shall be covered with a protective material to prevent damage from sunlight, moisture, landscaping operations, equipment maintenance and wind. In attics and mechanical rooms, a way to access equipment that prevents damaging or compressing the insulation shall be provided. Foundation vents shall not interfere with the insulation. Insulation materials in ground contact shall have a water absorption rate no greater than .3 percent when tested in accordance with ASTM C272, shall cover the exposed exterior insulation and shall extend a minimum of 6 inches (153 mm) below grade.
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.