Plumber Red Seal · Question
A plumber is installing a water closet in a commercial washroom. The rough-in for the toilet flange is 305 mm (12 inches) from the finished wall. Which of the following is the standard rough-in measurement for a floor-mounted water closet?
The standard rough-in measurement for most floor-mounted water closets is 305 mm (12 inches) from the finished wall to the centre of the waste outlet. Other mea
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Question: A plumber is installing a water closet in a commercial washroom. The rough-in for the toilet flange is 305 mm (12 inches) from the finished wall. Which of the following is the standard rough-in measurement for a floor-mounted water closet?
Answer options: ✅ 305 mm (12 inches)
- 254 mm (10 inches)
- 381 mm (15 inches)
- 406 mm (16 inches)
Correct answer: 305 mm (12 inches)
Explanation: The standard rough-in measurement for most floor-mounted water closets is 305 mm (12 inches) from the finished wall to the centre of the waste outlet. Other measurements like 254 mm (10 inches) or 381 mm (15 inches) can be found but are less common standard options.
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