Carpenter Red Seal Exam Prep · Question
When installing a closed stringer stairway, the run of the stair is 3500 mm and the number of treads is 14. What is the individual tread depth?
The individual tread depth is calculated by dividing the total run by the number of treads. In this case, 3500 mm / 13 treads = 269.2 mm. Note that typically, f
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Question: When installing a closed stringer stairway, the run of the stair is 3500 mm and the number of treads is 14. What is the individual tread depth?
Answer options:
- 233.3 mm
- 250 mm ✅ 269.2 mm
- 291.7 mm
Correct answer: 269.2 mm
Explanation: The individual tread depth is calculated by dividing the total run by the number of treads. In this case, 3500 mm / 13 treads = 269.2 mm. Note that typically, for 14 risers, there are 13 treads.
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