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• R302.13

  Fire Protection of Floors

  • Unrated floors get 1/2 in gypsum or 5/8 in wood panel under the framing, unless sprinklered below, over a plain crawl space, built of 2x10 or larger lumber, or a small detached accessory floor.

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

• R606.2.2

  Clay or Shale Masonry Units

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

• R320.1

  General

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

• R319.4.2.1

  Ladders

  • Area well ladders are at least 12 in wide, stand 3 in off the wall, with rungs 18 in or less apart.

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

• R306.3.4

  Concrete Slabs

  • Slabs under coastal buildings are either breakaway (4 in thick at most, unreinforced, jointed 4 ft or less) or fully structural.

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

• R404.1.3.2.2

  Concrete Foundation Stem Walls Supporting Light-Frame Above-Grade Walls

  • Stem walls under light framing follow R404.1.3 up to 48 in of retained fill; more than that needs design, or a designed slab connection if the slab braces the top.

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

• R503.3.1

  Identification and Grade

  International Residential Code, 2024 · Chapter 5, FloorsRead the full text (opens UpCodes in a new tab)

• R306.3.9

  Construction Documents

  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.