Carpenter Red Seal Exam Prep · Question
A carpenter is constructing a floor with a concentrated load from an interior pony wall above, coinciding with the mid-span of several joists. What is the most effective method, according to the NBC, to strengthen the joists in this localized area to prevent excessive deflection or failure?
For concentrated loads, doubling or even tripling joists, or using an engineered beam under the load, is the standard and most effective practice to distribute
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Question: A carpenter is constructing a floor with a concentrated load from an interior pony wall above, coinciding with the mid-span of several joists. What is the most effective method, according to the NBC, to strengthen the joists in this localized area to prevent excessive deflection or failure?
Answer options:
- Increase the joist spacing in that area
- Install blocking between the joists at the load point only ✅ Double the joists under the pony wall and extend them sufficiently
- Switch to a higher grade of lumber for the affected joists
Correct answer: Double the joists under the pony wall and extend them sufficiently
Explanation: For concentrated loads, doubling or even tripling joists, or using an engineered beam under the load, is the standard and most effective practice to distribute the load and increase the load-carrying capacity, as specified by the NBC and good engineering practice.
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