Trap Arm Length
Maximum trap arm length by pipe diameter and slope.
Example
You enter
- Pipe diameter (in) 2
- Slope (in/ft) 0.25
You get
- Maximum length 8 ft
- Table max 8 ft
- Pipe diameter (in) 2
Details, formula, and sources
Trap-arm horizontal length capped per IPC 2021 Section 909.1, Table 909.1 keyed to trap-arm size.
IPC 2021 (International Plumbing Code). Section 909, Table 909.1.
Free read-only access at codes.iccsafe.org.
Estimate. AHJ and licensed plumber / gas fitter govern. Verify against the IPC / IFGC edition adopted in your jurisdiction.
Field names used by the API: pipe_diameter_in, slope_in_per_ft, max_length_ft, table_max_ft
- Trap-arm slope 1/4 in per ft min, 1 pipe diameter max fallIPC 2021 Section 909.1