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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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  • R1003.15

    Flue Area (Masonry Fireplace)

    • Fireplace flues are sized by Option 1 (ratio to opening area) or Option 2 (chart).

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

  • R1003.9.2

    Spark Arrestors

    • A spark arrestor, where fitted, has four times the flue outlet's free area, a screen equal to 19-ga galvanized or 24-ga stainless, openings passing 3/8 in but not 1/2 in spheres, and is removable for cleaning.

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

  • R1003.18

    Chimney Clearances

    • Interior chimneys or those in an exterior wall keep 2 in airspace to combustibles; chimneys fully outside the walls keep 1 in; the gap stays open except for fireblocking.
    • Clearance exceptions: UL 1777 zero-clearance liners allow contact; built into a masonry wall or abutting the sidewalls, combustibles stay 8 in from the inside of the nearest flue liner.

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

  • R804.3

    Roof Construction

    • Steel roofs use both ceiling joists and rafters: sheathing screwed 6 in edge and 12 in field, gypsum 12 in, gable truss to track at 12 in, and 3 to 10 No. 10 screws per joist at the wall by wind and span.

    International Residential Code, 2024 · Chapter 8, Roof-Ceiling 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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