Every 2024 IRC section and the IBC as it loads, by number or topic, plus the local rules for your city. Free to search.
Detached houses, duplexes and townhouses up to 3 stories with their own exits use the IRC; every other building uses the IBC (IBC 101.2).
17 sections matching “IBC 508.4” for San Antonio, TX, the 2024 IRC
IBC 508.4
Separated occupancies
Buildings meeting this section are separated occupancies, divided per Table 508.4.
Sprinklered building examples: R to A, E, B, M, S-1, S-2 or U is 1 hour; A/E to B, M, S-1 1 hour; A/E to S-2/U none; B/F-1/M/S-1 to each other none; I-2 to most groups 2 hours; H-2 3 hours from A, B, R. Unsprinklered values are one hour higher or not permitted. Separations from areas used only for private vehicles drop 1 hour (not below 1).
Each separated space follows its own occupancy; Chapter 9's most restrictive rule applies across areas not split by fire barriers; fire-area separations also meet 901.7.
Separations are fire barriers (707) and/or horizontal assemblies (711); exposed mass timber in IV-B/IV-C separations needs a ½-in gypsum thermal barrier.
Unlimited mixed occupancy buildings with Group H-5
Two-story sprinklered B, F, H-5, M or S with 60-ft yards is unlimited if H-5 is Type I/II, separated per 415.11 and 508.4, and within its allowable area (or split by 2-hour barriers).
Mixed buildings use 508.3.2 or 508.4.2 per story; above three stories the sum of each story's actual/allowable ratios may not exceed 3 (4 with 13R and separated occupancies).
A-1 and A-2 (not Type V) may be in a 507.4 building if separated per 508.4.4 without sprinkler reduction, each within its own allowable area, with exits directly outside.
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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