Carpenter Red Seal Exam Prep · Question
A carpenter is installing 38 mm x 286 mm (2x12) No. 2 Douglas Fir-Larch (DF-L) floor joists for a single family dwelling. The joists are spaced at 400 mm on centre and support two storeys plus a roof. According to typical Canadian span tables, what is the approximate maximum clear span these joists can achieve under these conditions?
For 38x286 mm No. 2 DF-L joists at 400 mm on centre supporting two storeys plus roof, typical span tables (e.g., from NBC 2020 Appendix D) indicate a maximum cl
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Question: A carpenter is installing 38 mm x 286 mm (2x12) No. 2 Douglas Fir-Larch (DF-L) floor joists for a single family dwelling. The joists are spaced at 400 mm on centre and support two storeys plus a roof. According to typical Canadian span tables, what is the approximate maximum clear span these joists can achieve under these conditions?
Answer options: ✅ 5.0 metres
- 4.5 metres
- 5.5 metres
- 4.8 metres
Correct answer: 5.0 metres
Explanation: For 38x286 mm No. 2 DF-L joists at 400 mm on centre supporting two storeys plus roof, typical span tables (e.g., from NBC 2020 Appendix D) indicate a maximum clear span close to 5.0 metres.
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