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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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  • R408.8

    Under-Floor Vapor Retarder

    • In warm-humid zones 1A, 2A and 3A, floor insulation over a vented crawl space carries a vapor retarder of 1.5 perms or less on its exposed face.

    Local review: San Antonio (Bexar County) is climate zone 2A, so this applies to vented crawl spaces there.

    International Residential Code, 2024 · Chapter 4, FoundationsRead the full text (opens UpCodes in a new tab)

  • R602.3.3

    Bearing Studs

    • Framing spaced over 16 in sits within 5 in of studs at 24 in, unless the top plates are doubled 2x6 or 3x4, a third plate is added, or solid blocking reinforces the plate.

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

  • R1006.2

    Exterior Air Intake

    • The air intake draws from outdoors or a naturally vented crawl or attic, not from the garage or basement, sits no higher than the firebox (unless listed), and has a 1/4 in corrosion-resistant screen.

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

  • R302.9.5

    High-Density Polyethylene (HDPE) and Polypropylene (PP)

    • HDPE or polypropylene interior finish must pass the room-corner test.

    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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