Carpenter Red Seal Exam Prep · Question
When installing a pre-hung interior door, how much shim space should typically be left between the door frame jamb and the rough opening for proper adjustment and insulation?
According to typical Canadian carpentry practices, leaving approximately 12 mm (1/2 inch) of shim space on each side and at the top allows for proper plumbing,
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Question: When installing a pre-hung interior door, how much shim space should typically be left between the door frame jamb and the rough opening for proper adjustment and insulation?
Answer options:
- 6 mm (1/4 inch) ✅ 12 mm (1/2 inch)
- 25 mm (1 inch)
- 3 mm (1/8 inch)
Correct answer: 12 mm (1/2 inch)
Explanation: According to typical Canadian carpentry practices, leaving approximately 12 mm (1/2 inch) of shim space on each side and at the top allows for proper plumbing, levelling, and squaring of the door frame. Smaller gaps may not provide enough room for adjustment, while larger gaps are excessive.
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Other Canadian certifications candidates often prepare for alongside this one.