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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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  • 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)

  • R603.6

    Headers

    • Every exterior and bearing opening gets a box-beam or back-to-back steel header sized from the tables, or one per AISI S230/S240.

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

  • R1001.3.1

    Vertical Reinforcing

    • Chimneys up to 40 in wide get four continuous No. 4 vertical bars, grouted but kept from bonding to the flue liner; add two bars for each extra flue or each extra 40 in of width or part of it.

    International Residential Code, 2024 · Chapter 10, Chimneys and FireplacesRead the full text (opens UpCodes in a new tab)

  • R1001.10

    Hearth Extension Dimensions

    • The hearth extension reaches 16 in in front and 8 in to each side of the opening; for openings of 6 sq ft or more, 20 in in front and 12 in to each side.

    International Residential Code, 2024 · Chapter 10, Chimneys and FireplacesRead 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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