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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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  • R607.4

    Isolated Panels

    • Exterior glass block panels are capped at 144 sq ft (standard, at 20 psf) or 85 sq ft (thin, 20 psf max); interior panels 250 or 150 sq ft.

    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)

  • R302.15

    Fire-Retardant-Treated Wood

    • Fire-retardant-treated wood has a flame spread index of 25 or less, and in an extended 20-minute test the flame front stays within 10.5 ft.
    • Each FRTW piece is labelled, and is dried to 19% moisture or less for lumber and 15% or less for panels; interior FRTW stays at or below 28% at 92% humidity.

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

  • R603.1.1

    Applicability Limits

    • Prescriptive steel walls cover buildings up to 60 x 40 ft, three stories, under 140 mph in B or C, and 70 psf snow; all exterior steel walls count as bearing.

    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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