Carpenter Red Seal Exam Prep · Question
A carpenter is tasked with installing 15.9 mm (5/8 inch) tongue-and-groove oriented strand board (OSB) subflooring over floor joists. What is the appropriate expansion gap that should be left between the subfloor panels and at walls to account for moisture-induced expansion?
A 3 mm expansion gap between subfloor panels and at walls is typically recommended for OSB to allow for moisture-related expansion and contraction, preventing b
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Question: A carpenter is tasked with installing 15.9 mm (5/8 inch) tongue-and-groove oriented strand board (OSB) subflooring over floor joists. What is the appropriate expansion gap that should be left between the subfloor panels and at walls to account for moisture-induced expansion?
Answer options:
- 0 mm (tight fit) ✅ 3 mm
- 6 mm
- 12 mm
Correct answer: 3 mm
Explanation: A 3 mm expansion gap between subfloor panels and at walls is typically recommended for OSB to allow for moisture-related expansion and contraction, preventing buckling and warping. Installing panels too tightly can lead to significant problems.
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