Carpenter Red Seal Exam Prep · Question
A carpenter needs to calculate the roof pitch for a gable roof. The total span of the building is 8.4 metres, and the total rise from the top plate to the peak of the ridge is 2.1 metres. What is the roof pitch expressed as a rise-to-run ratio?
The run is half the total span, so 8.4 m / 2 = 4.2 m. The rise is 2.1 m. The pitch is rise/run = 2.1 m / 4.2 m = 0.5. To express this as X:12, multiply 0.5 by 1
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Question: A carpenter needs to calculate the roof pitch for a gable roof. The total span of the building is 8.4 metres, and the total rise from the top plate to the peak of the ridge is 2.1 metres. What is the roof pitch expressed as a rise-to-run ratio?
Answer options:
- 5:12 ✅ 6:12
- 4:12
- 7:12
Correct answer: 6:12
Explanation: The run is half the total span, so 8.4 m / 2 = 4.2 m. The rise is 2.1 m. The pitch is rise/run = 2.1 m / 4.2 m = 0.5. To express this as X:12, multiply 0.5 by 12, which equals 6. So the pitch is 6:12.
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