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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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  • R905.7

    Wood Shingles

    • Wood shingles go on solid or 1x4 spaced sheathing at 3:12 or steeper, are No. 1-3 durable wood, side-lapped 1-1/2 in and gapped 1/4-3/8 in, with two stainless or hot-dip nails 3/4 in into the deck.

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

  • R504.1.2

    Construction

    • Basement floor joists bear tight against wall studs or a band joist, plywood runs continuous over joints, and blocking carries end-wall thrust into the floor.

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

  • R804.3.1

    Ceiling Joists

    • Steel ceiling joists are sized from the span tables by bracing, bear 1-1/2 in, are screwed to rafters per the heel table, and continuous joists need supports within 24 in of midspan; occupied attics follow the floor rules.
    • Steel ceiling joist bottoms are braced by gypsum or 1-1/2 in straps at 4 ft; tops by 33-mil members or straps per the tables, with blocking every 12 ft; splices only over bearings.

    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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