Drainage, Waste & VentQuestion 115 of 360
The minimum slope for a 2-1/2 inch horizontal drainage pipe is:
a.1/8 inch per foot
b.1/16 inch per foot
c.1/4 inch per foot
d.1/2 inch per foot
Explanation
Pipe 2-1/2 inches and smaller requires a minimum slope of 1/4 inch per foot. The 1/8 inch per foot minimum applies only to pipe 3 inches and larger, so it is too flat here. The 1/16 inch value is below any code minimum, and 1/2 inch exceeds the required minimum.
Law Reference: 2022 California Plumbing Code (CPC) §708.1Practice all 360 questions free — no signup required.
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