Coastal and Floodplain Construction Inspector's Practice Exam

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What is the gap that must be left between sheathing panel edges for expansion?

1/16"
1/8"
1/4"
1/2"

The correct answer is: 1/8"

The correct gap that must be left between sheathing panel edges for expansion is 1/8 inch. This gap is essential to accommodate the natural expansion and contraction of the materials due to changes in temperature and humidity. Sheathing panels, such as those made from plywood or oriented strand board (OSB), can expand when moisture is absorbed and contract when it dries out. By leaving a space of 1/8 inch, it ensures that there is enough room for this movement without causing structural issues like buckling or warping. Additionally, the specific measurement of 1/8 inch strikes a balance; it is large enough to provide the necessary clearance while still allowing for a snug fit between panels to maintain the integrity of the structure. This consideration is crucial in both residential and commercial construction, especially in coastal and flood-prone areas where materials may be exposed to varying environmental conditions more frequently.