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• 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)

• R302.3.6.1

  Opening Protection

  International Residential Code, 2024 · Chapter 3, Building PlanningRead 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)

• R703.10.2

  Lap Siding

  International Residential Code, 2024 · Chapter 7, Wall CoveringRead the full text (opens UpCodes in a new tab)

• R318.7.5.3

  Nosings

  • Nosings project 3/4 to 1-1/4 in, uniform within 3/8 in, with a radius up to 9/16 in or a bevel up to 1/2 in; treads 11 in or deeper need none.

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

• R404.1.3.3.8

  Exterior Wall Coverings

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

• R315.5.3.1

  Size and Capacity

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

• R1003.3.1

  Vertical Reinforcing

  • Chimneys up to 40 in wide get four continuous No. 4 bars anchored in the foundation and grouted per R608.1.1, not bonded to the liner; add two bars per extra 40 in of width or part of it.

  International Residential Code, 2024 · Chapter 10, Chimneys and FireplacesRead 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.