Carpenter Red Seal Exam Prep · Question
When framing a floor, what is the maximum allowable cantilever for a 38x235 mm No. 2 SPF joist, assuming a typical residential floor load condition and proper backspan support, to prevent excessive deflection and structural issues?
The maximum allowable cantilever for floor joists is typically limited to prevent excessive bounce and deflection. For 38x235 mm joists, a common rule of thumb
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Question: When framing a floor, what is the maximum allowable cantilever for a 38x235 mm No. 2 SPF joist, assuming a typical residential floor load condition and proper backspan support, to prevent excessive deflection and structural issues?
Answer options: ✅ 600 mm
- 900 mm
- 1200 mm
- 1500 mm
Correct answer: 600 mm
Explanation: The maximum allowable cantilever for floor joists is typically limited to prevent excessive bounce and deflection. For 38x235 mm joists, a common rule of thumb and span table guidance restrict cantilevers to about 600 mm, or up to 1/3 of the backspan depending on specific conditions. This limitation is defined in the NBC.
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