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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 1,054 sections for San Antonio, TX, the 2024 IRC and IBC

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  • G2427.7.7

    Single-Wall Penetrations of Combustible Walls

    • Single-wall pipe through combustible exterior walls uses a ventilated thimble 4 in larger (2 in after 6 ft of open pipe), 6 in for unlisted, 12 in for low-heat, or cleared combustibles.

    International Residential Code, 2024 · Chapter 24, Fuel GasRead the full text (opens UpCodes in a new tab)

  • M1801.3.4

    Clearances

    • Chimneys and vents keep code and listed clearances to combustibles; masonry chimneys with a UL 1777 zero-clearance liner may touch combustibles, with noncombustible firestopping.

    International Residential Code, 2024 · Chapter 18, Chimneys and VentsRead the full text (opens UpCodes in a new tab)

  • M2301.4

    Heat Transfer Gases or Liquids and Heat Exchangers

    • No toxic fluids, ethylene glycol or flammables as transfer fluid; fluids are rated for the maximum temperature with a flash point 50 F above stagnation; heat exchangers per P2902.5.2.

    International Residential Code, 2024 · Chapter 23, Solar Thermal Energy SystemsRead the full text (opens UpCodes in a new tab)

  • G2428.2

    Application of single-appliance vent tables

    • Single-appliance Category I vents are sized from Tables G2428.2(1) (Type B connector) and G2428.2(2) (single-wall connector) by height, lateral and diameter, subject to G2428.2.1 to 2.17.

    International Residential Code, 2024 · Chapter 24, Fuel GasRead 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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