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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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  • R802.5.2.2

    Rafter Ties

    • Rafter ties are at least 2x4, nailed per the heel table, spaced 24 in or less; blocking is at least utility grade.

    International Residential Code, 2024 · Chapter 8, Roof-Ceiling ConstructionRead the full text (opens UpCodes in a new tab)

  • R703.3.4

    Minimum Fastener Length and Penetration

    • Most siding fasteners reach 1-1/2 in into framing (vinyl and polypropylene follow their own sections), plus the thickness of any foam.

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

  • R602.10.10

    Cripple Wall Bracing

    • Cripple walls are braced like the wall above, with 15% more length; in SDC D0/D1 and SDC C townhouses only panel methods, with panels no more than 14 ft apart.
    • Cripple walls 48 in or shorter can count as the first story; if any part is taller, the cripple wall is an extra story.

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

  • R302.13

    Fire Protection of Floors

    • Unrated floors get 1/2 in gypsum or 5/8 in wood panel under the framing, unless sprinklered below, over a plain crawl space, built of 2x10 or larger lumber, or a small detached accessory floor.

    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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