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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 237 sections for San Antonio, TX, the 2024 IRC and IBC

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  • N1111.1.2.3

    Duct System Leakage

    • If an alteration moves 25 percent of registers or ducts, or adds 25 percent duct length, the system is tested and leaks no more than 12.0 cfm/100 sq ft.

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

  • N1101.7

    Climate Zones

    • Use Figure or Table N1101.7 to find the climate zone by county; unlisted places use N1101.7.2. Moisture letters are A moist, B dry, C marine; an asterisk marks Warm Humid.

    Local review: San Antonio is in Bexar County, climate zone 2A and Warm Humid. Nearby counties differ (Kendall 3A, Medina 2B), so check the county for sites outside the city.

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

  • N1101.13

    Application

    • Residential buildings comply by one of four paths: prescriptive, simulated performance, Energy Rating Index, or tropical; work on existing buildings follows N1109.

    Local review: Texas sets a statewide minimum residential energy code and cities adopt their own edition with amendments; confirm the energy code edition San Antonio has adopted before relying on 2024 values.

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

  • N1102.5.5

    Air-Sealed Electrical and Communication Outlet Boxes

    • Air-sealed outlet boxes in the air barrier are sealed to it, surrounded by insulation, and tested and marked to NEMA OS 4.

    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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