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SECTION R406 2. Medium Dwelling Unit: 3.5 credits ADDITIONAL ENERGY EFFICIENCY All dwelling units that are not included in#1 or REQUIREMENTS. #3. R406.1 Scope.This section establishes options for Exception:Dwelling units serving R-2 additional criteria to be met for one-and two-family occupancies shall require 2.5 credits. dwellings and townhouses,as defined in Section 101.2 3. Large Dwelling Unit: 4.5 credits of the International Residential Code to demonstrate Dwelling units exceeding 5000 square feet of compliance with this code. conditioned floor area. R406.2 Additional energy efficiency requirements Exception:Dwelling units serving R-2 (Mandatory).Each dwelling unit in a residential occupancies shall require 2.5 credits. building shall comply with sufficient options from 4. Additions less than 500 square feet:. 0.5 credits . Table R406.2 so as to achieve the following minimum number of credits: The drawings included with the building permit application shall identify which options have been 1. Small Dwelling Unit: 1.5 credits selected and the point value of each option,regardless Dwelling units less than 1500 square feet in of whether separate mechanical,plumbing,electrical, conditioned floor area with less than 300 square or other permits are utilized for the project. feet of fenestration area.Additions to existing building greater than 500 square feet of heated floor area but less than 1500 square feet. TABLE 406.2 ENERGY CREDITS OPTION DESCRIPTION CREDIT(S) la EFFICIENT BUILDING ENVELOPE 1a: 0.5 Prescriptive compliance is based on Table R402.1.1 with the following modifications: Vertical fenestration U =0.28 Floor R-38 Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under entire slab or Compliance based on Section R402.1.4: Reduce the Total UA by 5%. lb EFFICIENT BUILDING ENVELOPE ib: 1.0 Prescriptive compliance is based on Table R402.1.1 with the following modifications: Vertical fenestration U =0.25 Wall R-21 plus R-4 Floor R-38 Basement wall R-21 int plus R-5 ci Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under entire slab or Compliance based on Section R402.1.4: Reduce the Total UA by 15%. lc EFFICIENT BUILDING ENVELOPE lc: 2.0 Prescriptive compliance is based on Table R402.1.1 with the following modifications: Vertical fenestration U =0.22 Ceiling and single-rafter or joist-vaulted R-49 advanced Wood frame wall R-21 int plus R-12 ci Floor R-38 Basement wall R-21 int plus R-12 ci Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under entire slab or Compliance based on Section R402.1.4: Reduce the Total UA by 30%. 1 da EFFICIENT BUILDING ENVELOPE id: 0.5 Prescriptive compliance is based on Table R402.1.1 with the following modifications: Vertical fenestration U=0.24 RE-34 2015 Washington State Energy Code -