Plumber Red Seal · Question
A plumber is designing the venting system for a multi-story commercial building. A 100 mm soil or waste stack typically requires what minimum nominal pipe size for its stack vent, according to the NPC?
The National Plumbing Code of Canada generally requires that a stack vent, and any vent pipe that extends through the roof, is not less than 65 mm nominal pipe
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Question: A plumber is designing the venting system for a multi-story commercial building. A 100 mm soil or waste stack typically requires what minimum nominal pipe size for its stack vent, according to the NPC?
Answer options:
- 38 mm
- 50 mm ✅ 65 mm
- 75 mm
Correct answer: 65 mm
Explanation: The National Plumbing Code of Canada generally requires that a stack vent, and any vent pipe that extends through the roof, is not less than 65 mm nominal pipe size where the soil or waste stack is 100 mm in size. This ensures adequate air circulation and prevents frost closure at the roof terminal.
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