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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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  • R702.4

    Ceramic Tile

    • Tile follows the ANSI A108/A118/A136/A137 standards, and tub and shower walls use glass-mat gypsum, fiber-reinforced gypsum, fiber-cement or cement board backers.

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

  • R902.2

    Fire-Retardant-Treated Shingles and Shakes

    • Fire-retardant shakes and shingles are pressure-treated per AWPA C1 and every bundle is labelled with its class, treater and agency.

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

  • R806.5

    Unvented Attic and Unvented Enclosed Rafter Assemblies

    • Unvented attics are allowed inside the thermal envelope with no Class I retarder on the ceiling, using spray foam against the deck, rigid foam above it, or a combination meeting the condensation R-value.
    • Condensation-control insulation for unvented attics is R-5 in zones 1-3 (none for tile roofs in 2B/3B), rising to R-10 (4C), R-15 (4A/B), R-20, R-25, R-30 and R-35 in zones 5-8.
    • In zones 1-3, unvented attics with fluffy insulation can use a vapor diffusion port near the ridge (1/600 of ceiling area, 20+ perms) on a 3:12 or steeper roof, with supply air of 50 cfm per 1,000 sq ft if insulation is at the deck.

    Local review: San Antonio (2A) unvented attics need at least R-5 of spray foam or rigid board at the roof deck, or a vapor diffusion port setup.

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

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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