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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 [1- <br />(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 0.5 <br />under 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 <br />under 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 <br />under 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 <br />under 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 <br />R-49 vaulted ceilings with full height of uncompressed insulation extending over the wall <br />toD Dlate at the eaves. <br />0.5 <br />Prescriptive Path — Single Family 2018 Washington State Energy Code-R <br />