Bathroom Plumbing Rough in Guide

Workflow

1. 1

   Layout Fixture Locations

   2 hours

   Plan toilet, vanity, and shower rough-in per IPC.

   Toilet Rough-In DistanceFixture Unit Count

   Show tips (2)
2. 2

   Size and Slope Drains

   4 hours

   Calculate drain pipe size and slope for branch runs.

   Drain Pipe Slope CalculatorSewer Line Sizing

   Show tips (2)
3. 3

   Run Supply Lines

   4 hours

   Size hot and cold supply; plan manifold or trunk-and-branch.

   Water Supply Line SizingPipe Sizing by Fixture Count

   Show tips (2)
4. 4

   Pressure Test Before Close

   2 hours

   Cap lines; pressurize and inspect before drywall.

   Water Pressure CalculatorPipe Friction Loss

   Show tips (2)

Tools Used

• Drain Pipe Slope Calculator
  Primary

  Verify drain slope meets code.

• Fixture Unit Count
  Primary

  Calculate fixture units for branch sizing.

• Water Supply Line Sizing
  Supporting

  Size supply lines for fixture count.

• Sewer Line Sizing
  Reference

  Confirm main drain capacity.

Reference Materials

• Long-Sweep 90s

  Long-sweep fittings reduce clog points vs short 90s.

• Stub-Out Alignment

  Laser-align stub-outs — finish trim shows crooked rough-in.

• Don't Bury Shutoffs

  Accessible shutoffs save emergency damage.

Related Scenarios

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• Whole House Repipe Planning Guide
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• Fix Kitchen Faucet Leak Guide
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