Drainage, Waste & VentQuestion 121 of 360
A plumber terminates a vent pipe through a residential roof that is used only for weather protection. What is the minimum height the vent must extend above the roof surface?
a.At least 6 inches (152 mm) above the roof
b.At least 3 inches above the roof
c.At least 12 inches above the roof
d.Flush with the roof surface
Explanation
The CPC requires a vent terminal to extend not less than 6 inches above the roof. A terminal set too low can be blocked by roofing material, snow, or debris, defeating the vent. Some jurisdictions require more height for snow load, but 6 inches is the code minimum.
Law Reference: 2022 California Plumbing Code (CPC) §906.1Practice all 360 questions free — no signup required.
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