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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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  • R803.2

    Wood Structural Panel Sheathing

    • Roof panels are graded and marked, exterior-rated if permanently exposed (Exposure 1 is fine underneath), span per the panel table, and overhang gable ends no more than 9 in without framing.

    International Residential Code, 2024 · Chapter 8, Roof-Ceiling ConstructionRead the full text (opens UpCodes in a new tab)

  • R403.1.8

    Foundations on Expansive Soils

    Used in checks
    • Foundations and slabs on expansive soil are designed per IBC 1808.6, unless a system with a good local track record is approved.

    Local review: Expansive clay is common around San Antonio; expect an engineered foundation.

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

  • R408.3

    Unvented Crawl Space

    • Unvented crawl spaces cover the ground with sealed Class I vapor retarder (6 in laps, 6 in up the walls) and get exhaust, conditioned air at 1 cfm per 50 sq ft, plenum use or a dehumidifier.

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

  • R602.10.1.2

    Location of Braced Wall Lines and Permitted Offsets

    • Braced wall lines are straight lines in plan; panels, exterior walls and interior bracing walls may sit up to 4 ft off the line, with no more than two-thirds of the bracing on one side.

    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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