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NORMATIVE APPENDIX A—
PRESCRIPTIVE BUILDING ENVELOPE TABLES


  • (This is a normative appendix and is part of this standard.)

    Tables A-1 through A-9 appear twice in this appendix. The nine tables are shown first with I-P units, followed by nine tables with SI units.

    For climate zones, see Section 5.1.4 of ANSI/ASHRAE/IES Standard 90.1 and Normative Appendix B of ANSI/ ASHRAE Standard 169.

    a. For the United States, the ANSI/ASHRAE Standard 169 climate zone map is reproduced above. A list of counties and their respective climate zones can be found in Table B1 in ANSI/ASHRAE Standard 169.

    b. For Canada, see Table B2 in ANSI/ASHRAE Standard 169.

    c. For available international locations (outside the US and Canada), see Table B3 in ANSI/ASHRAE Standard 169.

    d. For locations not provided in Table B2 or B3, see Table B4 (reproduced below) in ANSI/ASHRAE Standard 169 for the international climate zone definitions.

    International Climate Zone Definitions

    Climate Zone
    Number
    NameThermal Criteria (I-P)Thermal Criteria (SI)
    1Very Hot – Humid (1A), Dry (1B)9000 < CDD50°F5000 < CDD10°C
    2Hot – Humid (2A), Dry (2B)6300 < CDD50°F ≤ 90003500 < CDD10°C ≤ 5000
    3A, 3BWarm – Humid (3A), Dry (3B)4500 < CDD50°F ≤ 63002500 < CDD10°C ≤ 3500
    3CWarm – Marine (3C)CDD50°F ≤ 4500 and
    HDD65°F ≤ 3600
    CDD10°C ≤ 2500 and
    HDD18°C ≤ 2000
    4A, 4BMixed – Humid (4A), Dry (4B)CDD50°F ≤ 4500 and
    3600 < HDD65°F ≤ 5400
    2500 ≤ CDD10°C and
    2000 < HDD18°C ≤ 3000
    4CMixed – Marine (4C)3600 < HDD65°F ≤ 54002000 < HDD18°C ≤ 3000
    5A, 5B, 5C Cool– Humid (5A), Dry (5B), Marine (5C)5400 < HDD65°F ≤ 72003000 < HDD18°C ≤ 4000
    6A, 6BCold – Humid (6A), Dry (6B)7200 < HDD65°F ≤ 90004000 < HDD18°C ≤ 5000
    7Very Cold9000 < HDD65°F ≤ 126005000 < HDD18°C ≤ 7000
    8Subarctic12600 < HDD65°F7000 < HDD18°C

    TABLE A-1 (Supersedes Table 5.5-1 in ANSI/ASHRAE/IES Standard 90.1)
    Building Envelope Requirements for Climate Zone 1 (A, B) (I-P)

    Opaque ElementsNonresidentialResidentialSemiheated
    Assembly InsulationAssemblyInsulationAssemblyInsulation
    Max.Min. R-ValueMax.Min. R-ValueMax.Min.R-Value
    Roofs
    Insulation Entirely above DeckU-0.048R-20.0 ciU-0.039R-25.0 ciU-0.173R-5.0 ci
    Metal BuildingU-0.044R-19.0 + R-11.0 LsdU-0.035R-19.0 + R-11.0 LsU-0.082R-19.0
    Attic and OtherU-0.027R-38.0U-0.021R-49.0U-0.053R-19.0
    Walls, Above Grade
    MassU-0.151 aR-5.7 ciaU-0.123R-7.6 ciU-0.151aR-5.7 cia
    Metal BuildingU-0.079R-13.0 + R-6.5 ciU-0.079R-13.0 + R-6.5 ciU-0.147R-19.0
    Steel FramedU-0.077R-13.0 + R-5.0 ciU-0.077R-13.0 + R-5.0 ciU-0.124R-13.0
    Wood Framed and OtherU-0.064R-13.0 + R-3.8 ciU-0.064R-13.0 + R-3.8 ciU-0.089R-13.0
    Wall, Below Grade
    Below Grade WallC-1.140NRC-1.140NRC-1.140NR
    Floors
    MassU-0.137R-4.2 ciU-0.137R-4.2 ciU-0.322NR
    Steel JoistU-0.052R-19.0U-0.052R-19.0U-0.350NR
    Wood Framed and OtherU-0.051R-19.0U-0.051R-19.0U-0.282NR
    Slab-On-Grade Floors
    UnheatedF-0.730NRF-0.730NRF-0.730NR
    HeatedF-0.640R-7.5 for 12 in. +
    R-5 ci below
    F-0.640R-7.5 for 12 in. +
    R-5 ci below
    F-1.020R-7.5 for 12 in.
    Opaque Doors
    SwingingU-0.600U-0.600U-0.600
    Non-SwingingU-0.500U-0.500U-0.500
    FenestrationAssemblyAssemblyAssemblyAssemblyAssemblyAssembly
    Max. UMax. SHGCMax. UMax. SHGCMax. UMax. SHGC
    Vertical Fenestration,0%–40% of Wall
    Nonmetal framing: allbU-1.20SHGC-0.25 allU-1.20SHGC-0.25 allU-1.20SHGC-NR all
    Metal fr: curtainwall/storefrontcU-1.20U-1.20U-1.20
    Metal framing: entrance doorcU-1.20U-1.20U-1.20
    Metal framing: all othercU-1.20U-1.20U-1.20
    Skylight with Curb, Glass,% of Roof
    0%–2.0%Uall-0.71SHGCall-0.19Uall-0.71SHGCall-0.16Uall-1.98SHGCall-NR
    2.1%–5.0%Uall-0.71SHGCall-0.19Uall-0.71SHGCall-0.16Uall-1.98SHGCall-NR
    Skylight with Curb, Plastic,% of Roof
    0%–2.0%Uall-1.12SHGCall-0.27Uall-1.12SHGCall-0.27Uall-1.90SHGCall-NR
    2.1%–5.0%Uall-1.12SHGCall-0.27Uall-1.12SHGCall-0.27Uall-1.90SHGCall-NR
    Skylight without Curb, All,% of Roof
    0%–2.0%Uall-0.57SHGCall-0.19Uall-0.57SHGCall-0.19Uall-1.36SHGCall-NR
    2.1%–5.0%Uall-0.57SHGCall-0.19Uall-0.57SHGCall-0.19Uall-1.36SHGCall-NR
    The following definitions apply: ci = continuous insulation, Ls = liner system, NR = no (insulation) requirement.
    a Mass walls with a heat capacity greater than 12 Btu/ft2·ÂºF which are unfinished or finished only on the interior do not need to be insulated.
    b Nonmetal framing includes framing materials other than metal with or without metal reinforcing or cladding.
    c Metal framing includes metal framing with or without thermal break. The all other subcategory includes operable windows, fixed windows, and non-entrance doors.
    d Liner system without thermal spacer blocks for this case only.

    TABLE A-2 (Supersedes Table 5.5-2 in ANSI/ASHRAE/IES Standard 90.1)
    Building Envelope Requirements for Climate Zone 2 (A, B) (I-P)

    Opaque ElementsNonresidentialResidentialSemiheated
    AssemblyInsulationAssemblyInsulationAssemblInsulation
    Max.Min. R-ValueMax.Min. R-ValueMax.Min.R-Value
    Roofs
    Insulation Entirely above DeckU-0.039R-25.0 ciU-0.039R-25.0 ciU-0.173R-5.0 ci
    Metal BuildingU-0.035R-19.0 + R-11.0 LsU-0.035R-19.0 + R-11.0 LsU-0.068R-13.0 +R- 19.0
    Attic and OtherU-0.021R-49.0U-0.021R-49.0U-0.053R-19.0
    Walls, Above Grade
    MassU-0.123R-7.6 ciU-0.104R-9.5 ciU-0.151aR-5.7 cia
    Metal BuildingU-0.079R-13.0 + R-6.5 ciU-0.052R-13.0 + R-13.0 ciU-0.147R-19.0
    Steel FramedU-0.077R-13.0 + R-5.0 ciU-0.055R-13.0 + R-10.0 ciU-0.084R-13.0 + R-3.8 ci
    Wood Framed and OtherU-0.064R-13.0 + R-3.8 ciU-0.064R-13.0 + R-3.8 ciU-0.064R-13.0 + R-3.8 ci
    Wall, Below Grade
    Below Grade WallC-1.140NRC-1.140NRC-1.140NR
    Floors
    MassU-0.107R-6.3 ciU-0.087R-8.3 ciU-0.322NR
    Steel JoistU-0.038R-30.0U-0.038R-30.0U-0.052R-19.0
    Wood Framed and OtherU-0.033R-30.0U-0.026R-30.0 + R-7.5 ciU-0.051R-19.0
    Slab-On-Grade Floors
    UnheatedF-0.730NRF-0.730NRF-0.730NR
    HeatedF-0.640R-7.5 for 12 in. +
    R-5 ci below
    F-0.640R-7.5 for 12 in. +
    R-5 ci below
    F-1.020R-7.5 for 12 in.
    Opaque Doors
    SwingingU-0.600U-0.600U-0.600
    Non-SwingingU-0.500U-0.400U-0.500
    FenestrationAssemblyAssemblyAssemblyAssemblyAssemblyAssembly
    Max. UMax. SHGCMax. UMax. SHGCMax. UMax. SHGC
    Vertical Fenestration,0%–40% of Wall
    Nonmetal framing: allbU-0.75SHGC-0.25 allU-0.75SHGC-0.25 allU-1.20SHGC-NR all
    Metal fr: curtainwall/storefrontcU-0.70U-0.70U-1.20
    Metal framing: entrance doorcU-1.10U-1.10U-1.20
    Metal framing: all othercU-0.75U-0.75U-1.20
    Skylight with Curb, Glass,% of Roof
    0%–2.0%Uall-0.71SHGCall-0.19Uall-0.71SHGCall-0.16Uall-1.98SHGCall-NR
    2.1%–5.0%Uall-0.71SHGCall-0.19Uall-0.71SHGCall-0.16Uall-1.98SHGCall-NR
    Skylight with Curb, Plastic,% of Roof
    0%–2.0%Uall-1.12SHGCall-0.27Uall-1.12SHGCall-0.27Uall-1.90SHGCall-NR
    2.1%–5.0%Uall-1.12SHGCall-0.27Uall-1.12SHGCall-0.27Uall-1.90SHGCall-NR
    Skylight without Curb, All,% of Roof
    0%–2.0%Uall-0.57SHGCall-0.19Uall-0.57SHGCall-0.19Uall-1.36SHGCall-NR
    2.1%–5.0%Uall-0.57SHGCall-0.19Uall-0.57SHGCall-0.19Uall-1.36SHGCall-NR
    The following definitions apply: ci = continuous insulation, Ls = liner system, NR = no (insulation) requirement.