Carpenter Red Seal Exam Prep · Question
When framing a rough opening for an interior window that is 600 mm wide by 900 mm high, what would be the recommended rough opening dimensions, including standard allowances for shimming, level setting, and casing?
Standard practice for rough openings typically adds 15-20 mm to the width and 15-20 mm to the height of the actual window unit for shimming and fitting. For a 6
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Question: When framing a rough opening for an interior window that is 600 mm wide by 900 mm high, what would be the recommended rough opening dimensions, including standard allowances for shimming, level setting, and casing?
Answer options:
- 606 mm wide x 906 mm high
- 612 mm wide x 912 mm high ✅ 620 mm wide x 915 mm high
- 630 mm wide x 930 mm high
Correct answer: 620 mm wide x 915 mm high
Explanation: Standard practice for rough openings typically adds 15-20 mm to the width and 15-20 mm to the height of the actual window unit for shimming and fitting. For a 600x900 mm window, 620 mm wide x 915 mm high is a plausible and common rough opening size, providing sufficient clearance for installation and leveling.
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