Drainage, Waste & VentQuestion 155 of 360
An interior rainwater leader (a vertical storm pipe that carries storm water through a building) must be…
a.vented like a sanitary stack
b.trapped with a grease interceptor
c.installed and, where it connects to a horizontal storm drain, sized to handle the roof area served
d.connected to the sanitary building drain
Explanation
An interior rainwater leader (conductor) must be sized for the roof area it drains and connected to a properly sized horizontal storm drain, kept separate from sanitary piping. Because storm systems carry no sewage, they are not vented like sanitary stacks, though offsets and connections still follow the storm-drainage rules. Where a leader could receive sewer gas, a trap is required.
Law Reference: 2022 California Plumbing Code (CPC) §1101.0Practice all 360 questions free — no signup required.
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