Layout Fixture Locations
2 hoursPlan toilet, vanity, and shower rough-in per IPC.
Advanced2-3 days
Bathroom Plumbing Rough in Guide
Complete guide for bathroom plumbing rough in — step-by-step workflow, tools, checklist, and expert tips to get started.
remodelersplumberscontractors
Workflow
Size and Slope Drains
4 hoursCalculate drain pipe size and slope for branch runs.
Run Supply Lines
4 hoursSize hot and cold supply; plan manifold or trunk-and-branch.
Pressure Test Before Close
2 hoursCap lines; pressurize and inspect before drywall.
Tools Used
Checklist
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Planning
Drain
Supply
Inspection
Documentation
Reference Materials
Drain Slope IPCTable
Key benchmarks for bathroom plumbing rough in.
| Pipe Size | Min Slope | Max DFU |
|---|---|---|
| 2 inch | 1/4 in/ft | 21 |
| 3 inch | 1/8 in/ft | 48 |
| 4 inch | 1/8 in/ft | 216 |
Fixture UnitsFormula
Total DFU on branch determines minimum drain pipe diameter
Access PanelsStandard
IPC requires access within 10 ft of every trap and valve.
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.
Safety Notes
- Sawzall and demo create dust and sharp debris — wear respirator.
- Verify no electrical wires in path before cutting studs.