R406. ENERGY RATING INDEX COMPLIANCE ALTERNATIVE

R406 ENERGY RATING INDEX COMPLIANCE ALTERNATIVE Strike Section R406.2 (including Table R406.2) of the International Energy Conservation Code in their entirety and insert new Section R406.2 and Table R406.2 in the Energy Conservation Code-Residential Provisions in their place to read as follows. R406.2 Mandatory requirements. Compliance with this section requires that the provisions identified in Sections R401 through R404 labeled as “mandatory” be met. The building thermal envelope shall be greater than or equal to Table R406.2. TABLE R406.2 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa FENESTRATION U-FACTORb 0.35 U-Factor SKYLIGHTb U-FACTOR 0.60 U-Factor GLAZED FENESTRATION SHGCb No Requirement CEILING R-38 WOOD FRAME WALL R-13 MASS WALL R-5 exterior continuous or R-10 interior continuous FRAME FLOOR R-19 MASS FLOOR R-15 BASEMENT WALL R-10 continuous or R-13 in cavity SLAB c R-VALUE & DEPTH R-10 for the first 2 feet CONDITIONED CRAWLSPACE WALL R-10 continuous or R-13 in cavity For SI: 1 foot = 304.8 mm. a. R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the installed R-value of the insulation shall not be less than the R-value specified in the table. b. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. c. R-5 shall be added to the required slab edge R-values for heated slabs. Strike Section R406.4 (including Table R406.4) of the International Energy Conservation Code in their entirety and insert new Section R406.4 and Table 406.4 in the Energy Conservation Code-Residential Provisions in their place to read as follows. R406.4 ERI-based compliance. Compliance based on an ERI analysis requires that the rated design be shown to have an ERI less than or equal to 54 when compared to the ERI reference design. R406.4.1 Renewable energy. The use of renewable energy is not allowed to meet the minimum requirement of 54 as listed in R406.4. SOURCE: Final Rulemaking published at 67 DCR 6326 (May 29, 2020 – Part 2). The District of Columbia Energy Conservation Code (2017), referred to as the “Energy Conservation Code,” consists of ANSI/ASHRAE/IES 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings (ASHRAE 90.1) and substantial portions of Chapter 7 of ANSI/ASHREA/IES 189.1-2014, Standard for the Design of High-Performance Green Buildings Except Low-Rise Residential Buildings (ASHRAE 189.1), published by the American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE), and the Residential Provisions of the 2015 edition of the International Energy Conservation Code (International Energy Conservation Code), published by the International Code Council (ICC), as amended by the Energy Conservation Code Supplement of 2017 – Commercial Provisions (12-I[CE] DCMR) and the Energy Conservation Code Supplement of 2017 – Residential Provisions (12-I[RE] DCMR). The International Energy Conservation Code is copyrighted by the ICC and therefore is not republished here. However, a copy of the text may be obtained at: https://codes.iccsafe.org/public/document/IECC2015. ASHRAE 90.1 is copyrighted by ASHRAE and therefore is not republished here. However, the text of ASHRAE 90.1 may be reviewed at: https://www.ashrae.org/standards-research--technology. Portions of Chapter 7 of ASHRAE 189.1 are reprinted in the District of Columbia Energy Conservation Code Supplement by permission of ASHRAE and ICC. District of Columbia Municipal Regulations Energy Conservation Code Supplement of 2017 – Residential Provisions 12-I[RE] DCMR § R406