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Search the building code.

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).

A random sample from 1,598 sections for San Antonio, TX, the 2024 IRC

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  • R321.1.1

    Where Required

    • A guard is needed wherever an open side drops more than 30 in within 36 in of its edge; insect screen doesn't count.

    International Residential Code, 2024 · Chapter 3, Building PlanningRead the full text (opens UpCodes in a new tab)

  • R503.2.2

    Allowable Spans

    • Panel subfloor spans follow the span rating table or APA E30; the common subfloor ratings are 16, 20, 24, 32 and 48 in on center.
    • Sanded plywood used as combination subfloor is at least 1/2 to 1 in thick depending on species group and 16 to 24 in joist spacing.

    International Residential Code, 2024 · Chapter 5, FloorsRead the full text (opens UpCodes in a new tab)

  • R905.2.4.1

    Wind Resistance of Asphalt Shingles

    • Shingle wind rating by design wind speed: up to 116 mph D, G or H (D7158) or A, D or F (D3161); to 155 mph G or H / F; above that H / F.

    International Residential Code, 2024 · Chapter 9, Roof AssembliesRead the full text (opens UpCodes in a new tab)

  • R408.8

    Under-Floor Vapor Retarder

    • In warm-humid zones 1A, 2A and 3A, floor insulation over a vented crawl space carries a vapor retarder of 1.5 perms or less on its exposed face.

    Local review: San Antonio (Bexar County) is climate zone 2A, so this applies to vented crawl spaces there.

    International Residential Code, 2024 · Chapter 4, FoundationsRead the full text (opens UpCodes in a new tab)

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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