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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 235 sections for San Antonio, TX, the 2024 IRC

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  • N1103.3.5

    Ductwork Buried Within Ceiling Insulation

    • Ducts buried in ceiling insulation are R-8 with at least R-19 of insulation around them; in zones 0A-3A supply ducts are fully buried at R-13 with a vapor retarder (R-8 in unvented attics with diffusion ports), except the last 3 ft.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1108.2.1.3

    Roof Solar Reflectance Index

    • Low-slope roofs in zones 0-2 earn credit with a 3-year aged SRI of 75 or more over 95 percent of the roof, excluding PV, equipment, shaded and ballasted areas.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1101.10.1.1

    Blown-in or Sprayed Roof and Ceiling Insulation

    • Blown or sprayed attic insulation gets depth markers, one per 300 sq ft, fixed to framing, facing the attic access, with numbers at least 1 in tall.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1104.2.2

    Specific Locations

    • Lights in garages, unfinished basements, laundry and utility rooms shut off automatically within 20 minutes of vacancy, with a manual switch.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead 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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