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R401.3 Mandatory requirements for residential buildings. Residential <br />building must comply with the following sections from the 2021 <br />International Energy Conservation Code. <br />Table R401.3 <br />Mandatory requirements for residential buildings <br />Title <br />IECC Section <br />Vapor retarder <br />R402.1.1 <br />Eave baffle <br />R402.2.3 <br />Access hatches and doors <br />R402.2.4.1 <br />Crawl space wall insulation <br />R402.4.1.2 <br />Maximum fenestration U-factor and SHGC <br />R402.5 <br />Mechanical Controls <br />R403.1 <br />Ducts <br />R403.3 except R403.3.2, R403.3.3, and <br />R403.6 <br />Mechanical system piping insulation <br />R403.4 <br />Heated water circulation and temperature maintenance <br />systems <br />R403.5.1 <br />Drain Water heat recovery units <br />R403.5.3 <br />Mechanical ventilation <br />R403.6 including E403.6.1 <br />Equipment sizing and efficiency rating <br />R403.7 <br />Systems serving multiple dwelling units <br />R403.8 <br />Snow melt and ice systems <br />R403.9 <br />Energy consumption of pools and spas <br />R403.10 <br />Portables as <br />R403.11 <br />Residential pools and permanent residential spas <br />R403.12 <br />Lighting equipment <br />R404.1 <br />Interior lighting controls <br />R404.2 <br />46. Section R401.2 General, is hereby amended to read as follows: <br />R401.2 General. The building thefmal efivelepe shall eemply with the <br />. The building thermal <br />envelope shall comply with the requirements of Section R402.1.1 and <br />R402.1.2. <br />47. Section R402.1.2 Insulation and fenestration, is hereby deleted and <br />replaced with the following: <br />13 <br />