Carpenter Red Seal Exam Prep · Question
When laying out a hip roof, what is the common difference in length between consecutive equal-pitched common rafters when they are spaced at 600 mm on-centre?
If common rafters are spaced 600 mm on-centre, the run difference between consecutive rafters is 600 mm. For equal-pitched roofs, the rafter length difference i
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Question: When laying out a hip roof, what is the common difference in length between consecutive equal-pitched common rafters when they are spaced at 600 mm on-centre?
Answer options:
- 300 mm
- 424 mm ✅ 600 mm
- 848 mm
Correct answer: 600 mm
Explanation: If common rafters are spaced 600 mm on-centre, the run difference between consecutive rafters is 600 mm. For equal-pitched roofs, the rafter length difference is directly proportional to this run difference, making it 600 mm.
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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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