Carpenter Red Seal Exam Prep · Question
A carpenter is framing a floor with 38x184 mm No. 2 SPF joists. What is the maximum clear span these joists can have if they are spaced at 300 mm on centre, under typical residential floor loads (live load 1.9 kN/m², dead load 0.7 kN/m²)?
Consulting Canadian span tables (derived from CSA O86/NBC), 38x184 mm No. 2 SPF joists at 300 mm o.c. typically achieve a maximum clear span around 3.8 metres f
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Question: A carpenter is framing a floor with 38x184 mm No. 2 SPF joists. What is the maximum clear span these joists can have if they are spaced at 300 mm on centre, under typical residential floor loads (live load 1.9 kN/m², dead load 0.7 kN/m²)?
Answer options:
- 3.5 metres ✅ 3.8 metres
- 4.1 metres
- 4.4 metres
Correct answer: 3.8 metres
Explanation: Consulting Canadian span tables (derived from CSA O86/NBC), 38x184 mm No. 2 SPF joists at 300 mm o.c. typically achieve a maximum clear span around 3.8 metres for standard residential loading conditions before deflection or strength becomes an issue.
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