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What is the recommended minimum gap around the edges of plywood decking on a composition shingle roof?

1/16 inch
1/8 inch
1/4 inch
1/2 inch

The correct answer is: 1/8 inch

The recommended minimum gap around the edges of plywood decking on a composition shingle roof is 1/8 inch. This gap is crucial for allowing for expansion and contraction of the plywood due to temperature changes and moisture. Adequate spacing helps prevent the edges of the plywood from buckling or warping when subjected to these conditions. Additionally, it allows for proper drainage and helps reduce the risk of water pooling, which can lead to deterioration of the roofing materials and structures over time. While other gap measurements may seem plausible, they do not provide an optimal balance of structural support and necessary allowances for movement that 1/8 inch does. Therefore, following the 1/8 inch guideline is essential for maintaining the longevity and effectiveness of the roofing system.