Drainage, Waste & VentQuestion 151 of 360
Where a vent penetrates the roof, the plumber must provide…
a.a backwater valve
b.a cleanout at the roof
c.a flashing (jacket) to make the roof penetration watertight
d.a pressure-reducing valve
Explanation
Every vent that passes through the roof must be made watertight with a proper flashing or roof jacket. Without it, rainwater would leak into the structure around the pipe. The flashing is sealed to both the roofing and the vent pipe.
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