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• P2903.1

  Water Supply System Design Criteria

  • Water systems are sized for peak demand using minimum flow and pressure at each outlet, e.g. shower 2.5 gpm at 20 psi, lavatory 0.8 gpm at 8 psi, tank toilet 3 gpm at 20 psi.

  International Residential Code, 2024 · Chapter 29, Water Supply and DistributionRead the full text (opens UpCodes in a new tab)

• P2704

  Slip-Joint Connections

  International Residential Code, 2024 · Chapter 27, Plumbing FixturesRead the full text (opens UpCodes in a new tab)

• P2723

  Macerating Toilet Systems

  International Residential Code, 2024 · Chapter 27, Plumbing FixturesRead the full text (opens UpCodes in a new tab)

• P3107.3

  Connection at Different Levels

  • Common vents for drains at different levels extend the vertical drain, sized for the upper fixture (1-1/2 in 1 DFU, 2 in 4, 2-1/2-3 in 6); the upper fixture can't be a toilet.

  International Residential Code, 2024 · Chapter 31, VentsRead the full text (opens UpCodes in a new tab)

• P3006

  Sizing of Drain Pipe Offsets

  International Residential Code, 2024 · Chapter 30, Sanitary DrainageRead the full text (opens UpCodes in a new tab)

• P3009.9

  Subsurface Graywater Soil Absorption System Site Location

  • Absorption sites sit downhill of wells, stay set distances away (tank and field: 5 and 2 ft from buildings, 50 and 100 ft from wells, 10 ft from mains), never under driveways, with surface water diverted.

  International Residential Code, 2024 · Chapter 30, Sanitary DrainageRead the full text (opens UpCodes in a new tab)

• P3201

  Fixture Traps

  International Residential Code, 2024 · Chapter 32, TrapsRead the full text (opens UpCodes in a new tab)

• P2906.17

  Above-Ground Joints

  • Push-in pressure-lock fittings may join copper and CPVC above ground inside.

  International Residential Code, 2024 · Chapter 29, Water Supply and DistributionRead 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.