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heated <br />Building Code Board of Appeals <br />Agenda <br />September 25, 2024 <br />Page 11 of 64 <br />Metal framed R-21+ R-l0ci <br />Wood framed and other R-21 <br />Walls, Below grade C402.2.5 <br />Below -grade wall' I R-10 <br />Floors C402.2.3 <br />Mass' R-21 <br />Joist/framing R-3 8 <br />Slab -on -grade floors C402.2.4 <br />Unheated R-20 for 24" below <br />Heated' R-15 for 36" below + R-5 full slab <br />For SI: 1 inch = 25.4 mm, 1 pound per square foot = 4.88 kg/m2, 1 pound per cubic foot = 16 kg/m3. <br />NR = No Requirement, LS = Liner System. <br />a.Where using R-value compliance method, a thermal spacer block shall be provided, <br />b.Where heated slabs are below grade, below -grade walls shall comply with the exterior insulation requirements for <br />slabs. <br />c."Mass floors" shall be in accordance with Section C402.2.3. <br />d."Mass walls" shall be in accordance with Section C402.2.2. <br />e. The first value is for perimeter insulation and the second value is for full, under -slab insulation. <br />9. Section C402.1.4 Assembly U-factor, C-factor or F-factor-based <br />method, is hereby deleted in its entirety. <br />10. Section C402.1.5 Component performance alternative, is hereby <br />deleted in its entirety. <br />11. Table C402.4 Building Envelope Fenestration Maximum U-Factor and <br />SHGC Requirements, is hereby deleted and replaced with the <br />following: <br />Maximum U-Factor <br />Maximum SHGC <br />Table C402.4 <br />Building Envelope Fenestration <br />Vertical Fenestration <br />0.45 <br />0.33 <br />Maximum Air leakage rate for all fenestration except curtain walls <br />and storefront glazing .20 cfm/ft2 <br />Maximum air leakage rate for curtain walls and storefront glazing .06 cfm/ft <br />Skylights <br />Maximum U-Factor 0.50 <br />