Carpenter Red Seal Exam Prep · Question
A carpenter is installing drywall on a ceiling in a residential renovation. The ceiling joists are spaced at 600 mm on centre. Which thickness of drywall should be used to prevent sagging and ensure proper screw holding?
For ceiling applications with framing spaced at 600 mm on centre, 15.9 mm (5/8") drywall is recommended to prevent sagging. Thinner drywall like 9.5 mm or 12.7
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Question: A carpenter is installing drywall on a ceiling in a residential renovation. The ceiling joists are spaced at 600 mm on centre. Which thickness of drywall should be used to prevent sagging and ensure proper screw holding?
Answer options:
- 9.5 mm (3/8")
- 12.7 mm (1/2") ✅ 15.9 mm (5/8")
- 19 mm (3/4")
Correct answer: 15.9 mm (5/8")
Explanation: For ceiling applications with framing spaced at 600 mm on centre, 15.9 mm (5/8") drywall is recommended to prevent sagging. Thinner drywall like 9.5 mm or 12.7 mm would likely sag over this span, while 19 mm is typically overkill for standard residential ceiling applications.
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