Carpenter Red Seal Exam Prep · Question
A carpenter is preparing to install tongue-and-groove oriented strand board (OSB) subflooring. What is the recommended practice concerning the long edges that meet over a joist?
End joints of adjacent subfloor panels should be staggered by at least two joist spaces to maintain structural continuity and distribute loads effectively throu
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Question: A carpenter is preparing to install tongue-and-groove oriented strand board (OSB) subflooring. What is the recommended practice concerning the long edges that meet over a joist?
Answer options:
- They should be tightly butted together with no gap.
- They should have a 3 mm gap to allow for expansion. ✅ They should be offset by at least 2 joist spaces at end joints.
- They should be glued to the top of the joist but not nailed.
Correct answer: They should be offset by at least 2 joist spaces at end joints.
Explanation: End joints of adjacent subfloor panels should be staggered by at least two joist spaces to maintain structural continuity and distribute loads effectively throughout the floor system, thus preventing a continuous weak line. While a slight gap is often recommended for side edges (not end joints), the primary concern for end joints is staggering. Gluing and nailing are both standard practices.
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