Plumber Red Seal · Question
A plumber is installing a 100 mm building sewer from a single-family dwelling. What is the minimum recommended slope for this building sewer according to the National Plumbing Code of Canada?
According to the National Plumbing Code of Canada, the minimum slope for a 100 mm building sewer is 1:50. This slope ensures adequate flow velocity to prevent s
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Question: A plumber is installing a 100 mm building sewer from a single-family dwelling. What is the minimum recommended slope for this building sewer according to the National Plumbing Code of Canada?
Answer options:
- 1:100 ✅ 1:50
- 1:25
- 1:20
Correct answer: 1:50
Explanation: According to the National Plumbing Code of Canada, the minimum slope for a 100 mm building sewer is 1:50. This slope ensures adequate flow velocity to prevent solids from settling and causing blockages. A slope of 1:100 is generally too flat for effective self-scouring in a 100 mm pipe.
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