Ratings may come from approved-source designs, prescriptive 721 designs, 722 calculations, engineering comparison with tested assemblies, or agency-certified designs.
Every building is Type I, II, III, IV or V; elements meet Table 601 ratings and exterior walls Table 705.5, per 703.2; opening protection only where other sections require.
Type IV uses mass timber or noncombustible elements meeting Table 601 via 703.2; IV-A, IV-B and IV-C need noncombustible protection per 703.6 and 722.7; CLT labeled to ANSI/APA PRG 320. Above 12 stories or 180 ft, exit and hoistway enclosures are noncombustible.
Searches all 4,276 IRC 2024 sections, 5,532 IBC 2024 sections and defined terms (Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 so far) and each city's local rules as they are added. Section numbers and titles from the International Residential Code and International Building Code, 2024 editions, copyrighted by the International Code Council; the IRC's electrical chapters (34 to 43) follow NFPA 70, the National Electrical Code. Requirements are summarized in our words (IRC Chapters 3 to 43, IBC Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33); read the full text at the link on each result. Local values come from each city's published documents.
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