Carpenter Red Seal Exam Prep · Question
When laying out a set of stairs, the unit rise (R) and unit run (T) should adhere to the 'comfort formula'. Which of the following relationships is generally considered ideal for a comfortable residential stair pitch?
The 'comfort formula' for stairs suggests that '2R + T' (twice the unit rise plus the unit run) should ideally fall between 600 mm and 630 mm for a comfortable,
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Question: When laying out a set of stairs, the unit rise (R) and unit run (T) should adhere to the 'comfort formula'. Which of the following relationships is generally considered ideal for a comfortable residential stair pitch?
Answer options: ✅ 2R + T = 600 mm to 630 mm
- R + T = 400 mm
- R - T = 150 mm
- R x T = 30000 mm²
Correct answer: 2R + T = 600 mm to 630 mm
Explanation: The 'comfort formula' for stairs suggests that '2R + T' (twice the unit rise plus the unit run) should ideally fall between 600 mm and 630 mm for a comfortable, safe walking pitch, as outlined in good carpentry practices and building code guidance.
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