Question 12
Domain 4: Wall Construction, Framing, and Exterior CoveringsWhat is the minimum required lap for wall sheathing at floor and roof framing connections?
Correct answer: D
Explanation
Wall sheathing used as bracing must extend continuously from the "bottom plate to top plate" so the load path is uninterrupted at floor and roof framing connections. A full-height panel provides the required transfer of lateral forces through the wall assembly, which is why the minimum lap is not a partial overlap but full-height coverage.
Why each option is right or wrong
A. No overlap required if properly nailed
B. Must extend across at least 2 framing members
C. Must be blocked or H-clipped at all edges
D. Wall bracing panels must be full height from bottom plate to top plate
Under the wall bracing provisions of the IRC, sheathing used as a braced wall panel must form a continuous load path from the bottom plate to the top plate, with no interruption at the floor or roof framing connection. IRC Section R602.10 requires braced wall panels to be full-height panels, and the panel must extend from the bottom plate to the top plate so lateral loads can be transferred through the wall assembly without a break.