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2018 Washington State Energy Code—Residential <br /> Prescriptive Energy Code Compliance for All Climate Zones in Washington <br /> Single Family—New&Additions (effective February 1, 2021) <br /> Table 406.3—Energy Credits(Single Family) <br /> Option Description Credits:SF <br /> 1. EFFICIENT BUILDING ENVELOPE OPTIONS <br /> Only one option from Items 1.1 through 1.7 may be selected in this category. <br /> Compliance with the conductive UA targets is demonstrated using Section R402.1.4,Total UA alternative,where: <br /> [1-(Proposed UA/Target UA)]>the required%UA reduction. <br /> Prescriptive compliance is based on Table R402.1.1 with the following modifications: <br /> 1.1 0.5 <br /> Vertical fenestration U=0.24 <br /> Prescriptive compliance is based on Table R402.1.1 with the following modifications: <br /> 1.2 1.0 <br /> Vertical fenestration U=0.20 <br /> Prescriptive compliance is based on Table R402.1.1 with the following modifications: <br /> Vertical fenestration U=0.28 <br /> Floor R-38 <br /> 1.3 Slab on grade R-10 perimeter and under entire slab below grade slab R-10 perimeter and under 0.5 <br /> entire slab or <br /> Compliance based on Section R402.1.4: Reduce the Total conductive UA by 5% <br /> Prescriptive compliance is based on Table R402.1.1 with the following modifications: <br /> Vertical fenestration U=0.25 <br /> Wall R-21 plus R-4 ci <br /> Floor R-38 <br /> 1.4 Basement wall R-21 int plus R-5 ci 1.0 <br /> Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under <br /> entire slab or <br /> Compliance based on Section R402.1.4: Reduce the Total conductive UA by 15% <br /> Prescriptive compliance is based on Table R402.1.1 with the following modifications: <br /> Vertical fenestration U=0.22 <br /> Ceiling and single-rafter or joist-vaulted R-49 advanced <br /> Wood frame wall R-21 int plus R-12 ci Floor R-38 <br /> 1.5 Basement wall R-21 int plus R-12 ci 2.0 <br /> Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under <br /> entire slab or <br /> Compliance based on Section R402.1.4: Reduce the Total conductive UA by 30% <br /> Prescriptive compliance is based on Table R402.1.1 with the following modifications: <br /> Vertical fenestration U=0.18 <br /> Ceiling and single-rafter or joist-vaulted R-60 advanced <br /> Wood frame wall R-21 int plus R-16 ci <br /> 1.6 Floor R-48 3.0 <br /> Basement wall R-21 int plus R-16 ci <br /> Slab on grade R-20 perimeter and under entire slab Below grade slab R-20 perimeter and under <br /> entire slab or <br /> Compliance based on Section R402.1.4: Reduce the Total conductive UA by 40%. <br /> Advanced framing and raised heel trusses or rafters <br /> Vertical Glazing U-0.28 <br /> 1.7 R-49 Advanced(U-0.020)as listed in Section A102.2.1, Ceilings below a vented attic and 0.5 <br /> R-49 vaulted ceilings with full height of uncompressed insulation extending over the wall top <br /> plate at the eaves. <br /> Rev.10-27-22 Prescriptive Path—Single Family 2018 Washington State Energy Code-R 4 <br />