Carpenter Red Seal Exam Prep · Question
According to the National Building Code of Canada (NBC) 2020, what is the maximum allowable projection of a nosing beyond the tread below it for a residential stair?
The NBC 2020, Sentence 3.4.6.4.(2), states that the maximum projection of a nosing beyond the tread below it shall be 25 mm to prevent tripping hazards.
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Question: According to the National Building Code of Canada (NBC) 2020, what is the maximum allowable projection of a nosing beyond the tread below it for a residential stair?
Answer options:
- 38 mm ✅ 25 mm
- 30 mm
- 19 mm
Correct answer: 25 mm
Explanation: The NBC 2020, Sentence 3.4.6.4.(2), states that the maximum projection of a nosing beyond the tread below it shall be 25 mm to prevent tripping hazards.
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