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• • <br /> WASHINGTON STATE ENERGY CODE, RESIDENTIAL PROVISIONS <br /> TABLE 406.2 <br /> ENERGY CREDITS(DEBITS) <br /> OPTION DESCRIPTION CREDIT(S) <br /> Ia EFFICIENT BUILDING ENVELOPE Ia: 0.5 <br /> Prescriptive compliance is based on Table R402.1.1 with the following modifications: <br /> Fenestration U .=0.28 <br /> Floor R-38 <br /> Slab on grade R-l0 perimeter and under entire slab <br /> Below grade slab R-10 perimeter and under entire slab <br /> or <br /> Compliance based on Section R402.1.4: Reduce the Total UA by 5%. <br /> lb EFFICIENT BUILDING ENVELOPE lb: 1.0 <br /> Prescriptive compliance is based on Table 8402.1.1 with the following modifications: <br /> Fenestration U.=0.25 <br /> Wall R-21 plus R-4 <br /> Floor R-38 <br /> Basement wall R-21 int plus R-5 ci <br /> Slab on grade R-10 perimeter and under entire slab <br /> Below grade slab R-10 perimeter and under entire slab <br /> or <br /> Compliance based on Section 8402.1.4: Reduce the Total UA by 15%. <br /> 1c EFFICIENT BUILDING ENVELOPE lc: 2.0 <br /> Prescriptive compliance is based on Table R402.I.1 with the following modifications: <br /> 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 <br /> Floor R-38 <br /> Basement wall R-2l int plus R-12 ci <br /> Slab on grade R-10 perimeter and under entire slab <br /> Below grade slab R-10 perimeter and under entire slab <br /> or <br /> Compliance based on Section R402.1.4: Reduce the Total UA by 30%. <br /> 2a AIR LEAKAGE CONTROL AND EFFICIENT VENTILATION 2a: 0.5 <br /> Compliance based on R402.4.1.2: Reduce the tested air leakage to 4.0 air changes per <br /> hour maximum <br /> and <br /> All whole house ventilation requirements as determined by Section M1507.3 of the <br /> International Residential Code shall be met with a high efficiency fan(maximum 0.35 <br /> watts/elm).not interlocked with the furnace fan ventilation systems using a furnace <br /> including an ECM motor are allowed,provided that they are controlled to operate at <br /> low speed in ventilation only mode. <br /> To qualify to claim this credit,the building permit drawings shall specify the option <br /> being selected and shall specify the option being selected and shall specify the <br /> maximum tested building air leakage and shall show the heat recovery ventilation <br /> system. <br /> 3 L: <br />