Carpenter Red Seal Exam Prep · Question
A carpenter is framing a floor system using 38x235 mm No. 2 Spruce-Pine-Fir (SPF) joists. According to common Canadian span tables, what is the maximum allowable clear span for these joists spaced at 400 mm on centre in a typical residential dwelling with a specified live load of 1.9 kN/m² and dead load of 0.7 kN/m²?
Based on typical CSA O86 and NBC span tables for 38x235 mm No. 2 SPF joists at 400 mm o.c. under standard residential loads, the conservative maximum span is ap
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Question: A carpenter is framing a floor system using 38x235 mm No. 2 Spruce-Pine-Fir (SPF) joists. According to common Canadian span tables, what is the maximum allowable clear span for these joists spaced at 400 mm on centre in a typical residential dwelling with a specified live load of 1.9 kN/m² and dead load of 0.7 kN/m²?
Answer options: ✅ 4.5 metres
- 4.8 metres
- 5.2 metres
- 5.5 metres
Correct answer: 4.5 metres
Explanation: Based on typical CSA O86 and NBC span tables for 38x235 mm No. 2 SPF joists at 400 mm o.c. under standard residential loads, the conservative maximum span is approximately 4.5 metres. Exceeding this would require larger members or closer spacing.
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