Carpenter Red Seal Exam Prep · Question
A carpenter is installing 19 mm tongue-and-groove plywood subflooring on joists spaced 400 mm on centre. What is the minimum recommended fastener schedule for nails along the joists if adhesive is also being used?
According to typical building codes and best practices for subfloor installation with adhesive, fasteners (nails or screws) should be spaced at 150 mm on centre
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Question: A carpenter is installing 19 mm tongue-and-groove plywood subflooring on joists spaced 400 mm on centre. What is the minimum recommended fastener schedule for nails along the joists if adhesive is also being used?
Answer options:
- 100 mm on centre ✅ 150 mm on centre
- 200 mm on centre
- 300 mm on centre
Correct answer: 150 mm on centre
Explanation: According to typical building codes and best practices for subfloor installation with adhesive, fasteners (nails or screws) should be spaced at 150 mm on centre along joists to ensure adequate hold-down and prevent squeaks. Wider spacing may not adequately secure the subfloor, while closer spacing is often unnecessary when adhesive is applied.
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