Which measurement is stated as the minimum sidelap for neighboring wood shingle courses?

Which measurement is stated as the minimum sidelap for neighboring wood shingle courses?

• A. 1-1/2 inches
• B. 0 inches
• C. 2 inches
• D. 3/4 inch

Answer: (A)

The measurement tested here is the amount by which the edge of the upper wood shingle must cover the shingle below it to keep the roof weather-tight. The minimum sidelap for neighboring wood shingle courses is 1-1/2 inches. This overlap ensures joints between shingles in the lower course are fully covered, which helps prevent water from penetrating and improves resistance to wind uplift as shingles expand, contract, or warp. It also provides adequate coverage for the fasteners and maintains proper installation tolerances. A smaller overlap (or none) would leave joints exposed and more prone to leaks and wind damage, while a larger overlap is not required by the standard minimum.

The measurement tested here is the amount by which the edge of the upper wood shingle must cover the shingle below it to keep the roof weather-tight. The minimum sidelap for neighboring wood shingle courses is 1-1/2 inches. This overlap ensures joints between shingles in the lower course are fully covered, which helps prevent water from penetrating and improves resistance to wind uplift as shingles expand, contract, or warp. It also provides adequate coverage for the fasteners and maintains proper installation tolerances. A smaller overlap (or none) would leave joints exposed and more prone to leaks and wind damage, while a larger overlap is not required by the standard minimum.