Carpenter Red Seal Exam Prep · Question
You are assessing an older house for a renovation. You notice significant deflection in a main floor joist spanning 4.2 metres (14 feet). What is a common and effective structural repair for an undersized or overstressed wood joist?
Sistering involves fastening a new joist alongside the existing one, effectively increasing the section's depth and stiffness, which is a common and effective m
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Question: You are assessing an older house for a renovation. You notice significant deflection in a main floor joist spanning 4.2 metres (14 feet). What is a common and effective structural repair for an undersized or overstressed wood joist?
Answer options:
- Replacing the joist with a larger dimension.
- Adding blocking between joists at mid-span. ✅ Sistering the existing joist with a new, equally sized joist.
- Applying a reinforcing plate to the underside of the joist.
Correct answer: Sistering the existing joist with a new, equally sized joist.
Explanation: Sistering involves fastening a new joist alongside the existing one, effectively increasing the section's depth and stiffness, which is a common and effective method to strengthen an undersized or deflecting joist.
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