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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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  • R802.6

    Bearing

    • Rafters and ceiling joists bear 1-1/2 in on wood or metal and 3 in on masonry or concrete; on 3:12 or steeper roofs with a proper tie, bearing on the ridge board is enough.

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

  • R502.3.3

    Floor Cantilevers

    • A floor cantilever reaches no farther than the joist depth, unless it follows the tables for a bearing wall and roof or a balcony.
    • Cantilevers get a full-depth rim at the end and solid blocking at the support; blocking can be skipped for cantilevers of 24 in or less in SDC A to C.
    • Table cantilevers need a backspan of at least 3 times the cantilever under a wall and roof, or 2 times for a balcony, with uplift ties at the backspan.

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

  • R802.1

    General

    • Roof lumber is graded under DOC PS 20 (HRA-marked if finger-jointed in rated assemblies), and engineered members meet their own standards.

    International Residential Code, 2024 · Chapter 8, Roof-Ceiling ConstructionRead 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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