Drainage, Waste & VentQuestion 61 of 360
What is the minimum slope for a 2 inch horizontal drainage pipe?
a.1/4 inch per foot
b.1/8 inch per foot
c.1/16 inch per foot
d.1/2 inch per foot
Explanation
The CPC requires a minimum uniform slope of 1/4 inch per foot (about 2 percent) for horizontal drainage pipe 2-1/2 inches and smaller. The 1/8 inch per foot minimum is allowed only for pipe 3 inches and larger, so it is too flat for a 2 inch line. The 1/16 inch and 1/2 inch values are not the code minimum for this size.
Law Reference: 2022 California Plumbing Code (CPC) §708.1Practice all 360 questions free — no signup required.
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