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IPC Chapter 7 — Sanitary Drainage

Updated Mar 25, 2026
DWV system: pipe sizing by DFU, slopes, cleanouts, traps, building drains.

IPC Ch7: sizing by DFU. Lavatory=1, toilet=3-4, bathtub=2, kitchen sink=2. Branch: 1.5in=3 DFU, 2in=6, 3in=35, 4in=216. Slope: 1/4 in/ft (<=3in), 1/8 in/ft (>=4in). Cleanouts at stacks, junctions, every 100ft. P-traps required, S-traps prohibited.

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IPCdrainageDWVpipe-sizingcleanouttrap
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code year
2024
code section
Chapter 7
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