Building Code Board of Appeals Agenda and Packet 2025 05 12

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Building Code Board of Appeals Packet May 12, 2025 Page 5 of 64 This clears up ambiguity by saying Tiny Homes need to meet the IRC appendix that specifically pertains to Tiny Homes, instead of the IECC. [Clarification] 6. Section R402.1 General is amended by adding a new exception as follows: 3. Tiny homes, as defined in the International Residential Code, designed in accordance with Appendix BB of the International Residential Code. This amendment allows slab insulation to be omitted in sunrooms and heated garages if full compliance with other insulation requirements are met. In retrofits in particular, slab insulation requirements could necessitate complete demolition of the slab floor. [Flexibility and cost reduction] 7. Section R402.5.1.1 Sunroom and heated garage insulation is amended by adding a new exception as follows: 3. Slab insulation shall be permitted to be omitted where the minimum ceiling insulation R-values and minimum wall insulation R-values are installed. This amendment requires insulation installation to meet a standard for high quality, while exempting performance -based pathways that already account for insulation effectiveness through modeling. (LECC) [Clarification] [Minor strengthening from base] [Minor simplification from LECC] 8. Section R402.5.1.1 Installation is amended to read as follows: R402.5.1.1 Installation. The components of the building thermal envelope as indicated in Table R402.5.1.1 shall be installed in accordance with the following: 1. The manufacturer's instructions. 2. The criteria indicated in Table R402.5.1.1, as applicable to the method of construction. 3. For dwelling units complying with Section R401.2.1, the reauirements of a Grade 1 insulation installation in accordance with Appendix A of ANSI/RESNET/ICC 301.