Plumber Red Seal · Question
A plumber is installing a wall-hung lavatory in a commercial washroom. According to the National Plumbing Code of Canada (NPC), what is the typical rough-in measurement from the finished floor to the centre of the fixture outlet for a standard wall-hung lavatory?
The typical rough-in measurement from the finished floor to the centre of the fixture outlet for a standard wall-hung lavatory is approximately 500 mm (20 inche
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Question: A plumber is installing a wall-hung lavatory in a commercial washroom. According to the National Plumbing Code of Canada (NPC), what is the typical rough-in measurement from the finished floor to the centre of the fixture outlet for a standard wall-hung lavatory?
Answer options:
- 400 mm (16 inches) ✅ 500 mm (20 inches)
- 600 mm (24 inches)
- 760 mm (30 inches)
Correct answer: 500 mm (20 inches)
Explanation: The typical rough-in measurement from the finished floor to the centre of the fixture outlet for a standard wall-hung lavatory is approximately 500 mm (20 inches) as per common plumbing practices and NPC guidelines for fixture Trap Arms, allowing for standard trap installation. Other options are generally too low or too high for typical lavatory installations.
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