Carpenter Red Seal Exam Prep · Question
A carpenter is framing a floor system for a residential addition. The floor joists are 38 mm x 235 mm (2x10) No. 2 Spruce-Pine-Fir (SPF) and need to span a clear opening of 4.2 metres. According to typical Canadian joist span tables for residential loading (1.9 kN/m² live load, 0.48 kN/m² dead load), what is the maximum allowable clear span for these joists?
Typical joist span tables for 38x235 mm No. 2 SPF joists with residential loading (e.g., NBC 2020 referenced values) allow a clear span of approximately 4.3 met
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Question: A carpenter is framing a floor system for a residential addition. The floor joists are 38 mm x 235 mm (2x10) No. 2 Spruce-Pine-Fir (SPF) and need to span a clear opening of 4.2 metres. According to typical Canadian joist span tables for residential loading (1.9 kN/m² live load, 0.48 kN/m² dead load), what is the maximum allowable clear span for these joists?
Answer options: ✅ 4.3 metres
- 3.9 metres
- 4.5 metres
- 4.1 metres
Correct answer: 4.3 metres
Explanation: Typical joist span tables for 38x235 mm No. 2 SPF joists with residential loading (e.g., NBC 2020 referenced values) allow a clear span of approximately 4.3 metres. This makes the 4.2-metre span acceptable.
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