Carpenter Red Seal Exam Prep · Question
A carpenter is installing 19 mm thick plywood subflooring over joists spaced at 400 mm on centre. What is the recommended nail or screw spacing for perimeter fastening of the subfloor panels according to typical building practices?
Typical building code requirements and best practices for subfloor fastening specify fasteners at 150 mm on centre along panel edges (perimeter) and 300 mm on c
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Question: A carpenter is installing 19 mm thick plywood subflooring over joists spaced at 400 mm on centre. What is the recommended nail or screw spacing for perimeter fastening of the subfloor panels according to typical building practices?
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: Typical building code requirements and best practices for subfloor fastening specify fasteners at 150 mm on centre along panel edges (perimeter) and 300 mm on centre in the field (intermediate joists) to ensure adequate attachment and prevent squeaks or movement.
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