Carpenter Red Seal Exam Prep · Question
What is the maximum clear span for a double 38 mm x 235 mm (2x10) header made of No. 2 SPF lumber supporting a single storey and roof above, where the header is located in an exterior wall?
According to typical Canadian header span tables (e.g., NBC Appendix D), a double 38x235 mm (2x10) No. 2 SPF header can span approximately 2.7 metres when suppo
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Question: What is the maximum clear span for a double 38 mm x 235 mm (2x10) header made of No. 2 SPF lumber supporting a single storey and roof above, where the header is located in an exterior wall?
Answer options: ✅ 2.7 metres
- 2.1 metres
- 3.0 metres
- 2.4 metres
Correct answer: 2.7 metres
Explanation: According to typical Canadian header span tables (e.g., NBC Appendix D), a double 38x235 mm (2x10) No. 2 SPF header can span approximately 2.7 metres when supporting a single storey and roof.
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