Plumber Red Seal · Question
According to the NPC, a plumbing vent stack must terminate a minimum of how far above a roof?
The NPC requires vent pipes to terminate at least 150 mm (6 inches) above the roof surface to prevent blockage from snow accumulation and to ensure proper dispe
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Question: According to the NPC, a plumbing vent stack must terminate a minimum of how far above a roof?
Answer options:
- 100 mm (4 in) ✅ 150 mm (6 in)
- 300 mm (12 in)
- 450 mm (18 in)
Correct answer: 150 mm (6 in)
Explanation: The NPC requires vent pipes to terminate at least 150 mm (6 inches) above the roof surface to prevent blockage from snow accumulation and to ensure proper dispersion of sewer gases away from the roof surface.
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