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• N1103.6.2

  Fan Efficacy for Whole-House Mechanical Ventilation Systems and Outdoor Air Ventilation

  • Whole-house ventilation fans meet listed efficacy minimums in cfm per watt.

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

• N1102.2.11.1

  Crawl Space Wall Insulation Installation

  • Crawl wall insulation runs from the sill to the top of the footing (or the crawl floor if over 24 in below grade), and exposed earth gets a sealed Class I vapor retarder lapped 6 in and run 6 in up the walls.

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

• N1109

  Existing Buildings—General

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

• N1110

  Additions

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• N1102.2.2

  Ceilings Without Attics

  • Ceilings without attic space may drop to R-30 where more won't fit, uncompressed over the plate, limited to 500 sq ft or 20 percent of ceiling area, whichever is less.

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

• N1102

  Building Thermal Envelope

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

• N1111

  Alterations

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• N1101.5.2

  Solar-Ready System

  • Where a solar-ready zone is provided, the plans show its roof area, dead, live and snow loads, and the conduit or plumbing route to the panel or water heater.

  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.