Plumber Red Seal · Question
A plumber is installing an 89 mm diameter building sewer and needs to ensure proper slope for gravity flow. According to the National Plumbing Code of Canada, what is the minimum required slope for a building sewer of this diameter?
According to the National Plumbing Code of Canada (NPC), the minimum slope for building sewers having a diameter of 75 mm or 100 mm (including 89 mm) is 1 in 50
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Question: A plumber is installing an 89 mm diameter building sewer and needs to ensure proper slope for gravity flow. According to the National Plumbing Code of Canada, what is the minimum required slope for a building sewer of this diameter?
Answer options:
- 1 in 100 ✅ 1 in 50
- 1 in 25
- 1 in 20
Correct answer: 1 in 50
Explanation: According to the National Plumbing Code of Canada (NPC), the minimum slope for building sewers having a diameter of 75 mm or 100 mm (including 89 mm) is 1 in 50. A slope of 1 in 100 is generally too flat for efficient self-cleaning of solids.
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