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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).

14 sections matching “R325” for San Antonio, TX, the 2024 IRC

  • R325.2

    Bathrooms

    • Bathrooms have at least 3 sq ft of window, half of it openable, unless they have artificial light and an exhaust fan to outdoors.

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

  • R325.5

    Outside Opening Protection

    • Exterior intake and exhaust openings have corrosion-resistant screens with openings of 1/4 to 1/2 in.

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

  • R325.6

    Interior Stairway Illumination

    • Interior stairs are lit to at least 1 footcandle, with a switch at each floor when there are six or more risers.

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

  • R325.7

    Exterior Stairway Illumination

    • Exterior stairs have a light at the top landing, and basement stairs also at the bottom.

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

  • R325.8

    Required Heating

    • Where the winter design temperature is below 60°F, heating holds 68°F in habitable rooms; portable heaters don't count.

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

  • R325.1.1

    Natural Light

    • Habitable rooms have glazing equal to at least 8% of their floor area, facing a street, yard or court.
    • Glazing may face a roofed porch that's at least 65% open on its long side with a 7 ft ceiling, or a sunroom; or artificial light averaging 6 footcandles at 30 in can replace it.

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

  • R325.1.2

    Natural Ventilation

    • Habitable rooms can open to the outdoors over at least 4% of their floor area, unless mechanical ventilation is provided.
    • Vent openings may open to a porch at least 40% open, or to a sunroom with an opening of at least a tenth of the room's area and 20 sq ft.

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

  • R325.1.3

    Adjoining Rooms

    • Two rooms count as one for light and air when at least half the shared wall is open, giving a tenth of the inner room's area and at least 25 sq ft.

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

  • R325.4.1

    Intake Openings

    • Outdoor air intakes are at least 10 ft from vents, chimneys, streets and parking, unless 3 ft or more below the source.

    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.

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