Carpenter Red Seal Exam Prep · Question
A gable roof has a ridge height of 4.2 metres from the top plate and a building width of 9.6 metres (measured from outside of top plate to outside of top plate). What is the common 'pitch' designation for this roof?
The run is half the building width, so 9.6 m / 2 = 4.8 m. The rise is 4.2 m. To find pitch in 12: (Rise / Run) * 12 = (4.2 / 4.8) * 12 = 0.875 * 12 = 10.5. The
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Question: A gable roof has a ridge height of 4.2 metres from the top plate and a building width of 9.6 metres (measured from outside of top plate to outside of top plate). What is the common 'pitch' designation for this roof?
Answer options:
- 8:12
- 9:12 ✅ 10:12
- 11:12
Correct answer: 10:12
Explanation: The run is half the building width, so 9.6 m / 2 = 4.8 m. The rise is 4.2 m. To find pitch in 12: (Rise / Run) * 12 = (4.2 / 4.8) * 12 = 0.875 * 12 = 10.5. The closest common pitch is 10:12 or 11:12; 10:12 or 10.5:12. Thus 10:12 is the common designation.
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