Carpenter Red Seal Exam Prep · Question
When framing a standard interior door opening for a 813 mm (32") wide door, what is the rough opening (RO) width typically required?
For a standard 813 mm (32") door, the rough opening width is typically 838 mm (33"). This allows for the door frame (jamb) plus shims for plumbing and squaring
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Question: When framing a standard interior door opening for a 813 mm (32") wide door, what is the rough opening (RO) width typically required?
Answer options:
- 819 mm (32 1/4")
- 826 mm (32 1/2") ✅ 838 mm (33")
- 851 mm (33 1/2")
Correct answer: 838 mm (33")
Explanation: For a standard 813 mm (32") door, the rough opening width is typically 838 mm (33"). This allows for the door frame (jamb) plus shims for plumbing and squaring the frame, generally adding 25 mm (1") to the door width.
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