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Ll Ell SECTION R406 ADDITIONAL ENERGY EFFICIENCY REQUIREMENTS R406.1 Scope. This section establishes options for additional criteria to be met for one- and two-family dwellings and townhouses, as defined in Section 101.2 of the International Residential Code to demonstrate compliance with this code. R406.2 Additional energy efficiency requirements (Mandatory). Each dwelling unit in a residential building shall comply with sufficient options from Table R406.2 so as to achieve the following minimum number of credits: =credits1. Small Dwelling Unit:.......;/ ........... Dwelling units less than 1500 square feet in conditioned floor area with less than 300 square feet of fenestration area. Additions to existing building greater than 500 square feet of heated floor area but less than 1500 square feet. 2. Medium Dwelling Unit: .................. 3.5 credits All dwelling units that are not included in #1 or #3. Exception: Dwelling units serving R 2 occupancies shall require 2.5 credits. 3. Large Dwelling Unit: ...................... 4.5 credits Dwelling units exceeding 5000 square feet of conditioned floor area. Exception: Dwelling units serving R-2 occupancies shall require 2.5 credits. 4. Additions less than 500 square feet:. 0.5 credits The drawings included with the building permit application shall identify which options have been selected and the point value of each option, regardless of whether separate mechanical, plumbing, electrical, or other permits are utilized for the project. TABLE 406.2 ENERGY CREDITS OPTION DESCRIPTION CREDIT(S) la EFFICIENT BUILDING ENVELOPE Ia: 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 lb: 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 Ic: 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 A Reduce the Total UA by 30%. I& EFFICIENT BUILDINGENVELOPEld: 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