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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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  • R703.1.1

    Water Resistance

    • A wall that passes ASTM E331 rain testing (4 x 8 ft sample with an opening, joint, eave and sill, at 6.24 psf for 2 hours) can skip the drainage and barrier rules.

    International Residential Code, 2024 · Chapter 7, Wall CoveringRead the full text (opens UpCodes in a new tab)

  • R902.1

    Roof Assemblies

    • A fire-rated (Class A, B or C) roof is required where local law says so or where the roof edge is within 3 ft of a lot line, tested to ASTM E108 or UL 790 and labelled.

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

  • R602.3.2

    Top Plate

    • Wood walls get a double top plate, lapped at corners and bearing walls, with joints offset at least 24 in and plates at least as wide as the studs.
    • A single top plate is allowed if joints are tied with steel plates and nails per the table and rafters or joists land within 1 in of the studs.

    International Residential Code, 2024 · Chapter 6, Wall ConstructionRead the full text (opens UpCodes in a new tab)

  • R301.2.1.4

    Exposure Category

    • Exposure B is the default; use C for open terrain that extends more than 1,500 ft, or when the site borders more than 600 ft of open terrain.
    • Exposure D applies facing at least 5,000 ft of open water or flats, and reaches inland the greater of 600 ft or 20 times the building height.
    • In a subdivision, exposure is judged as if neighbouring homes starting within a year are already built.

    International Residential Code, 2024 · Chapter 3, Building PlanningRead 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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