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IPC Chapter 7 — Sanitary Drainage

Updated Mar 26, 2026
DFU calculations, pipe sizing, slope requirements, pipe materials, cleanout placement.

IPC Ch7: DFU (WC 3-4, lav 1, tub 2, kitchen sink 2). Pipe sizing: 2in=21 DFU, 3in=42, 4in=216 at 1/4in/ft slope. Min slope: 1/4in/ft for 2.5in and smaller, 1/8in/ft for 3in+. Cleanouts at base of stacks, direction changes >45°, every 100ft. Min 3in residential building drain.

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IPCdrainageDFUpipe-sizingslopecleanout
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code year
2024
code system
IPC
code section
Chapter 7
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