• NORMATIVE APPENDIXA
    CLIMATE ZONES AND PRESCRIPTIVE BUILDING ENVELOPE AND
    DUCT INSULATION TABLES

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

    Tables A101.1 (A-1) through A101.3 (A-3) appear twice in this appendix. The three tables are shown first with I-P units, followed by three tables with SI units.

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

    1. a.For locations in the United States and its territories, use ANSI/ASHRAE Standard 169, Table B-1, “U.S. States by State and County,” to determine the assigned climate zone and, where required, the assigned climate zone letter. Informative Note: Referenced Standard Reproduction Annex ASHRAE Standard 169 (included at the end of this document) contains an extraction of ANSI/ASHRAE Standard 169, Figure B-1, “Climate Zone for United States Counties,” (which is informative for Standards 90.1 and 189.1). ANSI/ASHRAE/IES Standard 90.1 Referenced Standard Reproduction Annex ASHRAE Standard 169 (included at the end of ANSI/ASHRAE/IES Standard 90.1) contains an extraction of ANSI/ASHRAE Standard 169, Table B-1, “U.S. States by State and County.”

    2. b.For locations in Canada that are listed in ASHRAE Standard 169, Table A-5, “Canada Stations and Climate Zones,” use this table to determine the assigned climate zone number and, where required, the assigned climate zone letter. For locations in other international countries that are listed in ASHRAE Standard 169, Table A-6, “International Stations and Climate Zones,” use this table to determine the required climate zone number and, where required, the assigned climate zone letter. For all international locations that are not listed either in ASHRAE Standard 169, Table A-5 or Table A-6, use ASHRAE Standard 169, Section A3, “Climate Zone Definitions,” and Table A-3, “Thermal Climate Zone Definitions,” to determine both the climate zone number and letter. Informative Note: Reference Standard Reproduction Annex ASHRAE Standard 169 (included at the end of this document) contains an extraction of ASHRAE Standard 169, Section A3, “Climate Zone Definitions,” and Table A-3, “Thermal Climate Zone Definitions.” ANSI/ASHRAE/IES Standard 90.1 Referenced Standard Reproduction Annex ASHRAE Standard 169 (included at the end of ANSI/ASHRAE/IES Standard 90.1) contains an extraction of ASHRAE Standard 169, Table A-5, “Canada Stations and Climate Zones,” and Table A-6, “International Stations and Climate Zones.”

    TABLE A101.1 (TABLE A-1)

    (SUPERSEDES TABLE A2.4.2 IN ANSI/ASHRAE/IES STANDARD 90.1) SINGLE-RAFTER ROOF REQUIREMENTS (I-P)

    CLIMATE ZONEMINIMUM INSULATION R-VALUE OR MAXIMUM ASSEMBLY U-FACTOR
    NONRESIDENTIALRESIDENTIALSEMIHEATED
    0, 1R-38 U-0.029R-38 + R10 ciU-0.022R-19U-0.055
    2R-38 + R10 ci U-0.022R-38 + R10 ciU-0.022R-19U-0.055
    3, 4, 5R-38 + R10 ciU-0.022R-38 + R10 ciU-0.022R-30U-0.036
    6R-38 + R10 ciU-0.022R-38 + R10 ciU-0.022R-38U-0.029
    7, 8R-38 + R15 ciU-0.020R-38 + R15 ciU-0.020R-38U-0.029

    TABLE A101.2 (TABLE A-2)

    (SUPERSEDES TABLE 6.8.2 IN ANSI/ASHRAE/IES STANDARD 90.1) MINIMUM DUCT INSULATION R-VALUEa HEATING- AND COOLING-ONLY SUPPLY DUCTS AND RETURN DUCTS (I-P)

    CLIMATE ZONEDUCT LOCATION
    EXTERIORVENTILATEDATTICUNVENTED ATTICABOVEINSULATEDCEILINGUNVENTED ATTICWITH ROOFINSULATION aUNCONDITIONEDSPACE bINDIRECTLYCONDITIONEDSPACE cBURIED
    Heating-Only Ducts
    0, 1, 2NoneNoneNoneNoneNoneNoneNone
    3R-6NoneNoneNoneR-6NoneNone
    4R.6NoneNoneNoneR-6NoneNone
    5R-8R-6NoneNoneR-6NoneR-6
    6R-8R-8R-6NoneR-6NoneR-6
    7R-10R-8R-8NoneR-6NoneR-6
    8R-10R-10R-8NoneR-8NoneR-8
    Cooling-Only Ducts
    0, 1R-6R-8R-10R-6R-6NoneR-6
    2R-6R-8R-10R-6R-6NoneR-6
    3R-6R-8R-8R-6R-3.5NoneNone
    4R-3.5R-6R-8R-3.5R-3.5NoneNone
    5, 6R-3.5R-3.5R-6R-3.5R-3.5NoneNone
    7, 8R-1.9R-3.5R-3.5R-3.5R-3.5NoneNone
    Return Ducts
    0 to 8R-6R-6R-6NoneNoneNoneNone
    1. a.Insulation R-values, measured in m2·k/kW, are for the insulation as installed and do not include film resistance. The required minimum thicknesses do not consider water vapor transmission and possible surface condensation. Where exterior walls are used as plenum walls, wall insulation shall be as required by the most restrictive condition of this table or Section 701.4.2 (7.4.2). Insulation resistance is measured on a horizontal plane in accordance with ASTM C518 at a mean temperature of 23.8 C at the installed thickness.

    2. b.Includes crawlspaces, both ventilated and nonventilated.

    3. c.Includes return air plenums with or without exposed roofs above.

    TABLE A101.3 (TABLE A-3)

    (SUPERSEDES TABLE 6.8.2 IN ANSI/ASHRAE/IES STANDARD 90.1) MINIMUM DUCT INSULATION R-VALUEa COMBINED HEATING AND COOLING SUPPLY DUCTS AND RETURN DUCTS (I-P)

    CLIMATEZONEDUCT LOCATION
    EXTERIORVENTILATEDATTICUNVENTED ATTICABOVE INSULATEDCEILINGUNVENTEDATTIC WITH ROOFINSULATIONaUNCONDITIONEDSPACEbINDIRECTLYCONDITIONEDSPACEcBURIED
    Supply Ducts
    0, 1R-8R-8R-10R-6R-6NoneR-6
    2R-8R-8R-8R-6R-8NoneR-6
    3R-8R-8R-8R-6R-8NoneR-6
    4R-8R-8R-8R-6R-8NoneR-6
    5R-8R-8R-8R-3.5R-8NoneR-6
    6R-10R-8R-8R-3.5R-8NoneR-6
    7R-10R-8R-8R-3.5R-8NoneR-6
    8R-10R11R11R-3.5R-8NoneR-8
    Return Ducts
    0 to 8R-6R-6R-6NoneNoneNoneNone
    1. a.Insulation R-values, measured in m2·k/kW, are for the insulation as installed and do not include film resistance. The required minimum thicknesses do not consider water vapor transmission and possible surface condensation. Where exterior walls are used as plenum walls, wall insulation shall be as required by the most restrictive condition of this table or Section 701.4.2 (7.4.2). Insulation resistance is measured on a horizontal plane in accordance with ASTM C518 at a mean temperature of 23.8 C at the installed thickness.

    2. b.Includes crawlspaces, both ventilated and non-ventilated.

    3. c.Includes return air plenums with or without exposed roofs above.

    TABLE A101.1 (TABLE A-1)

    (SUPERSEDES TABLE A2.4.2 IN ANSI/ASHRAE/IES STANDARD 90.1) SINGLE-RAFTER ROOF REQUIREMENTS (SI)

    CLIMATE ZONEMINIMUM INSULATION R-VALUE OR MAXIMUM ASSEMBLY U-FACTOR
    NONRESIDENTIALRESIDENTIALSEMIHEATED
    0, 1R-6.7 U-0.165R-6.7 + R-1.8 ci U-0.112R-3.3 U-0.312
    2R-6.7 + R-1.8 ci U-0.112R-6.7 + R-1.8 ci U-0.112R-3.3 U-0.312
    3, 4, 5R-6.7 + R-1.8 ci U-0.112R-6.7 + R-1.8 ci U-0.112R-5.3 U-0.204
    6R-6.7 + R-1.8 ci U-0.112R-6.7 + R-1.8 ci U-0.112R-6.7 U-0.165
    7, 8R-6.7 + R-2.6 ci U-0.111R-6.7 + R-2.6 ci U-0.111R-6.7 U-0.165

    TABLE A101.2 (TABLE A-2)

    (SUPERSEDES TABLE 6.8.2 IN ANSI/ASHRAE/IES STANDARD 90.1) MINIMUM DUCT INSULATION R-VALUEa HEATING- AND COOLING-ONLY SUPPLY DUCTS AND RETURN DUCTS (SI)

    CLIMATEZONEDUCT LOCATION
    EXTERIORVENTILATEDATTICUNVENTED ATTICABOVE INSULATEDCEILINGUNVENTED ATTICWITH ROOFINSULATIONaUNCONDITIONEDSPACEbINDIRECTLYCONDITIONEDSPACEcBURIED
    Heating-Only Ducts
    0, 1, 2NoneNoneNoneNoneNoneNoneNone
    3R-1.06NoneNoneNoneR-1.06NoneNone
    4R-1.06NoneNoneNoneR-1.06NoneNone
    5R-1.41R-1.06NoneNoneR 1.06NoneR-1.06
    6R-1.41R-1.41R-1.06NoneR 1.06NoneR-1.06
    7R-1.76R-1.41R-1.41NoneR-1.06NoneR-1.06
    8R-1.76R-1.76R-1.41NoneR-1.41NoneR-1.41
    Cooling-Only Ducts
    0, 1R-1.06R-1.41R-10R-1.06R-1.06NoneR-1.06
    2R-1.06R-1.41R-10R-1.06R-1.06NoneR-1.06
    3R-1.06R-1.41R-1.41R-1.06R-0.62NoneNone
    4R-0.62R-1.06R-1.41R-0.62R-0.62NoneNone
    5, 6R-0.62R-0.62R-1.06R-0.62R-0.62NoneNone
    7, 8R-1.9R-0.62R-0.62R-0.62R-0.62NoneNone
    Return Ducts
    0 to 8R-1.06R-1.06R-1.06NoneNoneNoneNone
    1. a.Insulation R-values, measured in m2·k/kW, are for the insulation as installed and do not include film resistance. The required minimum thicknesses do not consider water vapor transmission and possible surface condensation. Where exterior walls are used as plenum walls, wall insulation shall be as required by the most restrictive condition of this table or Section 701.4.2 (7.4.2). Insulation resistance measured on a horizontal plane in accordance with ASTM C518 at a mean temperature of 23.8 C at the installed thickness.

    2. b.Includes crawlspaces, both ventilated and non-ventilated.

    3. c.Includes return air plenums with or without exposed roofs above.

    TABLE A101.3 (TABLE A-3)

    (SUPERSEDES TABLE 6.8.2 IN ANSI/ASHRAE/IES STANDARD 90.1) MINIMUM DUCT INSULATION R-VALUEa COMBINED HEATING AND COOLING SUPPLY DUCTS AND RETURN DUCTS (SI)

    CLIMATEZONEDUCT LOCATION
    EXTERIORVENTILATEDATTICUNVENTED ATTICABOVE INSULATEDCEILINGUNVENTEDATTIC WITH ROOFINSULATIONaUNCONDITIONEDSPACEbINDIRECTLYCONDITIONEDSPACEcBURIED
    Supply Ducts
    0, 1R-1.41R-1.41R-1.76R-1.06R-1.06NoneR-1.06
    2R-1.41R-1.41R-1.41R-1.06R-1.41NoneR-1.06
    3R-1.41R-1.41R-1.41R-1.06R-1.41NoneR-1.06
    4R-1.41R-1.41R-1.41R-1.06R-1.41NoneR-1.06
    5R-1.41R-1.41R-1.41R-0.62R-1.41NoneR-1.06
    6R-1.76R-1.41R-1.41R-0.62R-1.41NoneR-1.06
    7R-1.76R-1.41R-1.41R-0.62R-1.41NoneR-1.06
    8R-1.76R-1.94R-1.94R-0.62R-1.41NoneR-1.41
    Return Ducts
    0 to 8R-1.06R-1.06R-1.06NoneNoneNoneNone
    1. a.Insulation R-values, measured in m2·k/kW, are for the insulation as installed and do not include film resistance. The required minimum thicknesses do not consider water vapor transmission and possible surface condensation. Where exterior walls are used as plenum walls, wall insulation shall be as required by the most restrictive condition of this table or Section 701.4.2 (7.4.2). Insulation resistance measured on a horizontal plane in accordance with ASTM C518 at a mean temperature of 23.8 C at the installed thickness.”

    2. b.Includes crawlspaces, both ventilated and non-ventilated.

    3. c.Includes return air plenums with or without exposed roofs above.

FEEDBACK LIVE CHAT