Drain Waste and Vent Pipe Hanger Spacing

Support of Drain Waste and Vent - DWV - pipes

Both vertical and horizontal drainage pipes must be supported properly. Recommended maximum distances between the hangers are indicated in the table below.

Piping MaterialDistance between Supports (ft)
Horizontal PipeVertical Pipe
ABS plastic 4 4
Galvanized steel 12 15
DWV Copper 10 10
Cast Iron 5 151)
PVC plastic 4 4

1) For cast iron stacks, the base of each stack must be supported

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