Which statement is true about the minimum sidelap between adjacent wood shingle courses?

Which statement is true about the minimum sidelap between adjacent wood shingle courses?

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

Answer: (A)

The main idea is how much the next course of wood shingles must overlap the course below to keep water from seeping in and to protect the fasteners. The minimum sidelap between adjacent wood shingle courses is one and a half inches. This amount is enough to ensure the upper course covers the nail line of the lower course and a good portion of the shingle below, which helps water shed properly and resists wind uplift. If the overlap were smaller, joints could expose fasteners or create weak seals, increasing the chance of leaks. If it were larger, it would work but wasteful and raise material costs without adding needed benefit. In typical residential plywood or cedar shingle installations, 1-1/2 inches is the standard minimum to meet weatherproofing and performance needs, though exact requirements can vary with product and slope, so always follow manufacturer guidelines.

The main idea is how much the next course of wood shingles must overlap the course below to keep water from seeping in and to protect the fasteners. The minimum sidelap between adjacent wood shingle courses is one and a half inches. This amount is enough to ensure the upper course covers the nail line of the lower course and a good portion of the shingle below, which helps water shed properly and resists wind uplift. If the overlap were smaller, joints could expose fasteners or create weak seals, increasing the chance of leaks. If it were larger, it would work but wasteful and raise material costs without adding needed benefit. In typical residential plywood or cedar shingle installations, 1-1/2 inches is the standard minimum to meet weatherproofing and performance needs, though exact requirements can vary with product and slope, so always follow manufacturer guidelines.