Carpenter Red Seal Exam Prep · Question
When framing, what is the 'common difference' when calculating the lengths of regular jack rafters for a common hip roof?
In a common hip roof with uniform pitch, the common difference is the constant change in length between adjacent jack rafters, which simplifies calculations.
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Question: When framing, what is the 'common difference' when calculating the lengths of regular jack rafters for a common hip roof?
Answer options: ✅ The constant change in length between consecutive jack rafters.
- The difference in rise between two adjacent rafters.
- The hypotenuse of the unit run and unit rise.
- The length of the hip rafter divided by the number of jack rafters.
Correct answer: The constant change in length between consecutive jack rafters.
Explanation: In a common hip roof with uniform pitch, the common difference is the constant change in length between adjacent jack rafters, which simplifies calculations.
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