Carpenter Red Seal Exam Prep · Question
A rough opening for a 900 mm wide window requires a header. The clear span for this header is 1.2 metres. The header will support a single storey with only roof framing (no upper floor). Using common Canadian lumber sizes and typical residential loads, which of the following header sizes (double members of SPF No. 2 lumber) would be adequate?
For a 1.2 metre clear span supporting only a roof system (no floor load), two 38x184 mm (2x8) SPF No. 2 members are typically sufficient according to prescripti
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Question: A rough opening for a 900 mm wide window requires a header. The clear span for this header is 1.2 metres. The header will support a single storey with only roof framing (no upper floor). Using common Canadian lumber sizes and typical residential loads, which of the following header sizes (double members of SPF No. 2 lumber) would be adequate?
Answer options: ✅ Two 38 mm x 184 mm (2x8) members
- Two 38 mm x 235 mm (2x10) members
- Two 38 mm x 140 mm (2x6) members
- Two 38 mm x 89 mm (2x4) members
Correct answer: Two 38 mm x 184 mm (2x8) members
Explanation: For a 1.2 metre clear span supporting only a roof system (no floor load), two 38x184 mm (2x8) SPF No. 2 members are typically sufficient according to prescriptive Canadian header span tables found in the NBC.
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