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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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  • R403.1.8.1

    Expansive Soils Classifications

    • Soil is expansive if its PI is 15 or more and over 10% passes a No. 200 sieve and over 10% is finer than 5 microns, or if its expansion index exceeds 20.

    International Residential Code, 2024 · Chapter 4, FoundationsRead 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)

  • R321.2.1

    Window Opening Height

    • An operable window with its sill under 24 in from the floor and more than 72 in above outside grade must limit the opening to 4 in or have an ASTM F2090 device.

    International Residential Code, 2024 · Chapter 3, Building PlanningRead the full text (opens UpCodes in a new tab)

  • R329.6.3

    Emergency Escape and Rescue Openings

    • No panels on the roof below an escape opening, and a 36 in pathway leads to it.

    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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