Carpenter Red Seal Exam Prep · Question
What is the typical maximum on-centre spacing for floor joists in residential construction when using 19 mm (3/4 in.) T&G plywood subfloor?
With 19 mm (3/4 in.) tongue and groove (T&G) plywood subflooring, a 600 mm (24 in.) on-centre joist spacing is commonly permissible, balancing structural integr
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Question: What is the typical maximum on-centre spacing for floor joists in residential construction when using 19 mm (3/4 in.) T&G plywood subfloor?
Answer options:
- 300 mm (12 in.)
- 400 mm (16 in.)
- 480 mm (19.2 in.) ✅ 600 mm (24 in.)
Correct answer: 600 mm (24 in.)
Explanation: With 19 mm (3/4 in.) tongue and groove (T&G) plywood subflooring, a 600 mm (24 in.) on-centre joist spacing is commonly permissible, balancing structural integrity with material efficiency.
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- When interpreting a foundation plan, a dashed line with 'P. WALL' typically represents which of the following?
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