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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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  • N1102.2.6

    Mass Walls

    • Mass walls are above-ground concrete, block, ICF, brick (not veneer), adobe, earth, solid or mass timber or logs, or any wall with heat capacity of 6 Btu/sq ft F or more.

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

  • N1101.6

    Defined Terms

    • Key energy definitions: above-grade walls are more than half above grade; balanced ventilation has supply and exhaust within 10 percent; insulating sheathing and insulated siding are at least R-2; low slope is under 2:12; opaque doors are at least half opaque.
    • More definitions: skylights slope under 60 degrees from horizontal; radiant barriers have emittance of 0.1 or less; sunrooms are over 40 percent glazed; substantial improvement costs at least half the building's value; residential buildings here are three stories or less.

    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)

  • N1103.10.3

    Covers

    • Heated outdoor pools and spas need a vapor-retardant cover unless over 75 percent of heat comes from a heat pump or on-site renewables.

    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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