Carpenter Red Seal Exam Prep · Question
When constructing a stair, what is the maximum permissible variation between adjacent risers and adjacent treads in the same flight, as per NBC 2020?
The NBC 2020 specifies that the maximum variation in height between adjacent risers and in depth between adjacent treads in a stair must not exceed 6 mm. This e
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Question: When constructing a stair, what is the maximum permissible variation between adjacent risers and adjacent treads in the same flight, as per NBC 2020?
Answer options:
- 5 mm
- 10 mm ✅ 6 mm
- 13 mm
Correct answer: 6 mm
Explanation: The NBC 2020 specifies that the maximum variation in height between adjacent risers and in depth between adjacent treads in a stair must not exceed 6 mm. This ensures a consistent and safe walking surface, preventing tripping hazards.
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- When interpreting a foundation plan, a dashed line with 'P. WALL' typically represents which of the following?
- A site plan shows contour lines with an interval of 0.5 m. If two adjacent contour lines are labelled 124.0 m
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- Two offset stakes are driven at 2.0 m from the proposed edge of a concrete slab. The first stake is marked 'Cu
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