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SECTION R406 2. Medium Dwelling Unit: 3.5 credits <br /> ADDITIONAL ENERGY EFFICIENCY All dwelling units that are not included in#1 or <br /> REQUIREMENTS #3. <br /> R406.1 Scope.This section establishes options for Exception: Dwelling units serving R-2 <br /> additional criteria to be met for one-and two-family occupancies shall require 2.5 credits. <br /> dwellings and townhouses,as defined in Section 101.2 3. Large Dwelling Unit: 4.5 credits <br /> of the International Residential Code to demonstrate Dwelling units exceeding 5000 square feet of <br /> compliance with this code. conditioned floor area. <br /> R406.2 Additional energy efficiency requirements Exception: Dwelling units serving R-2 <br /> (Mandatory).Each dwelling unit in a residential occupancies shall require 2.5 credits. <br /> building shall comply with sufficient options from 4. Additions less than 500 square feet:. 0.5 credits <br /> Table R406.2 so as to achieve the following minimum <br /> number of credits: The drawings included with the building permit <br /> application shall identify which options have been <br /> 1. Small Dwelling Unit: 1.5 credits selected and the point value of each option,regardless <br /> Dwelling units less than 1500 square feet in of whether separate mechanical,plumbing,electrical, <br /> conditioned floor area with less than 300 square or other permits are utilized for the project. <br /> feet of fenestration area.Additions to existing <br /> building greater than 500 square feet of heated <br /> floor area but less than 1500 square feet. <br /> TABLE 406.2 <br /> ENERGY CREDITS <br /> OPTION DESCRIPTION CREDIT(S) <br /> 1a EFFICIENT BUILDING ENVELOPE la: 0.5 <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 /> 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 5%. <br /> lb EFFICIENT BUILDING ENVELOPE lb: 1.0 <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 <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 R402.1.4: Reduce the Total UA by 15%. <br /> lc EFFICIENT BUILDING ENVELOPE lc: 2.0 <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 <br /> Floor R-38 <br /> Basement wall R-21 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 /> 1 da EFFICIENT BUILDING ENVELOPE 1 d: 0.5 <br /> Prescriptive compliance is based on Table R402.1.1 with the following modifications: <br /> Vertical fenestration U=0.24 <br /> RE-34 2015 Washington State Energy Code <br />