Search the building code.

• IBC 1202.1

  General

  • Buildings get natural ventilation per 1202.5 or mechanical ventilation per the IMC.

  Works withIBC 1202.5IBC 403IBC 407IMC

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.2

  Roof ventilation

  • Requirements for roof ventilation; see linked sections.

  Works withIBC 1202.3

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.3

  Unvented attic and unvented enclosed rafter assemblies

  • Unvented attics and rafter assemblies are allowed when insulation is in contact with the roof deck and per the air-impermeable insulation and vapor rules.

  Works withIRC R806.5IBC Table 1202.3IECC

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4

  Under-floor ventilation

  • Under-floor spaces (not basements) are ventilated per 1202.4.1, 1202.4.2 or 1202.4.3.

  Works withIRC R408IRC R408.2IBC 1202.4.1IBC 1202.4.2IBC 1202.4.3

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.5

  Natural ventilation

  • Natural ventilation is through windows, doors, louvers or other openings to outdoors, with controls occupants can reach.

  Works withIRC R325

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.6

  Other ventilation and exhaust systems

  • Requirements for other ventilation and exhaust systems; see linked sections.

  Works withIBC 1203IFCIMC

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.2.1

  Ventilated attics and rafter spaces

  • Enclosed attics and rafter spaces are cross-ventilated: net free area at least 1/150 of the space, 1/300 under the exception; 1 in air gap above insulation.

  Works withIRC R806

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.2.2

  Openings into attic

  • Requirements for openings into attic; see linked sections.

  Works withIBC Chapter 7IMC

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4.1

  Ventilation openings

  • Requirements for ventilation openings; see linked sections.

  Works withIBC 1202.4.1.1IBC 1202.4.1.2

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4.2

  Ventilation in cold climates

  • Requirements for ventilation in cold climates.

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4.3

  Mechanical ventilation

  • Requirements for mechanical ventilation; see linked sections.

  Works withIBC 1202.4.3.1IBC 1202.4.3.2

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4.4

  Flood hazard areas

  • Requirements for flood hazard areas; see linked sections.

  Works withIBC 1612.3

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.5.1

  Ventilation area required

  • Openable area to the outdoors is at least 4% of the floor area ventilated.

  Works withIRC R325

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.5.2

  Contaminants exhausted

  • Requirements for contaminants exhausted.

  Works withIFCIMC

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.5.3

  Openings on yards or courts

  • Requirements for openings on yards or courts; see linked sections.

  Works withIBC 1205

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4.1.1

  Ventilation area for crawl spaces with open earth floors

  • Requirements for ventilation area for crawl spaces with open earth floors.

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4.1.2

  Ventilation area for crawl spaces with covered floors

  • Requirements for ventilation area for crawl spaces with covered floors.

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4.3.1

  Continuous mechanical ventilation

  • Requirements for continuous mechanical ventilation.

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.4.3.2

  Conditioned space

  • Requirements for conditioned space.

  Works withIMCIECC

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.5.1.1

  Adjoining spaces

  • Requirements for adjoining spaces.

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.5.1.2

  Openings below grade

  • Requirements for openings below grade.

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1202.5.2.1

  Bathrooms

  • Requirements for bathrooms.

  Works withIMC

  International Building Code, 2024 · Chapter 12, Interior EnvironmentRead the full text (opens UpCodes in a new tab)

• IBC 1503.4

  Attic and rafter ventilation

  • Attic and rafter vents per 1202.2, unless unvented per 1202.3.

  Works withIBC 1202.2IBC 1202.3IRC R806

  International Building Code, 2024 · Chapter 15, Roof Assemblies and Rooftop StructuresRead 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.