Carpenter Red Seal Exam Prep · Question
A carpenter is framing a residential floor system measuring 6.0 m by 8.0 m. The floor joists are 38 mm x 235 mm SPF#2 and will span the 6.0 m direction. Which of the following joist spacings would be most appropriate to support a typical residential live load of 1.9 kN/m² and a dead load of 0.48 kN/m²?
For a 6.0 m span with 38 mm x 235 mm SPF#2 joists, a 300 mm on centre spacing is generally required to meet deflection and strength criteria for typical residen
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Question: A carpenter is framing a residential floor system measuring 6.0 m by 8.0 m. The floor joists are 38 mm x 235 mm SPF#2 and will span the 6.0 m direction. Which of the following joist spacings would be most appropriate to support a typical residential live load of 1.9 kN/m² and a dead load of 0.48 kN/m²?
Answer options: ✅ 300 mm on centre
- 400 mm on centre
- 488 mm on centre
- 600 mm on centre
Correct answer: 300 mm on centre
Explanation: For a 6.0 m span with 38 mm x 235 mm SPF#2 joists, a 300 mm on centre spacing is generally required to meet deflection and strength criteria for typical residential loads. Spacings of 400 mm, 488 mm, or 600 mm on centre would likely lead to excessive deflection or inadequate strength over a 6.0 m span for this size of lumber and species.
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