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VqA Residential Energy Code 2018 <br /> R402.1.1 Insulation and Fenestration Criteria <br /> The building thermal envelope shall meet the requirements of Table R402,1.1 based on the climate zone specified in Chapter 3. <br /> TABLE R402.1.1 <br /> INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa <br /> CLIMATE ZONE 5 AND MARINE 4 <br /> Fenestration U-Factory' 0,30 <br /> Skylightb U-Factor 0.50 <br /> Ceiling R-Valuee <br /> 49 <br /> Wood Frame Wallgh R-Value 21 int <br /> Floor R-Value 30 <br /> Below-Grade,"Wall R-Value 10/15/21 int+5TB <br /> Slabd,'R-Value and Depth 10,2 ft <br /> For SI: 1 foot=304.8 mm,ci-continuous insulation,int= intermediate framing. <br /> a.R-values are minimums. U-factors and SHGC are maximums.When insulation is installed in a cavity which is less than <br /> the label or design thickness of the insulation,the compressed R-value of the insulation from Appendix Table <br /> RA101.4 shall not be less than the R-value specified in the table. <br /> b.The fenestration U-factor column excludes skylights. <br /> c.10/15/21 +5TB"means R-10 continuous insulation on the exterior of the wall,or R-15 continuous insulation on the <br /> interior of the wall,or R-21 cavity insulation plus a thermal break between the slab and the basement wall at the <br /> interior of the basement wall.10/15/21 +5TB"shall be permitted to be met with R-13 cavity insulation on the <br /> interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the wall."5TB"means R-5 <br /> thermal break between floor slab and basement wall. <br /> d. R-10 continuous insulation is required under heated slab-on-grade floors.See Section R402.2.9.1. <br /> e. For single rafter or joist-vaulted ceilings,the insulation may be reduced to R-38 if the full insulation depth extends <br /> over the top plate of the exterior wall. <br /> f. R-7.5 continuous insulation installed over an existing slab is deemed to be equivalent to the required perimeter slab <br /> insulation when applied to existing slabs complying with Section R503.1.1.if foam plastic is used,it shall meet the <br /> requirements for thermal barriers protecting foam plastics. <br /> g. For log structures developed in compliance with Standard ICC 400, log walls shall meet the requirements for climate <br /> zone 5 of ICC 400. <br />