Thoát nước, Nước thải & Thông hơiCâu 151 / 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
Giải thích
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.
Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
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