What is the term for the distance between the exposed edges of overlapping shingles?

What is the term for the distance between the exposed edges of overlapping shingles?

• A. Exposure
• B. Sidelap
• C. Toplap
• D. Headlap

Answer: (A)

Exposure is the portion of a shingle that remains visible after installation. It’s the distance between the exposed edges of successive shingles, i.e., how much of the shingle you can see as you look along the roof. This measurement is set by how far the upper course overlaps the one below, and it determines how much of each shingle is exposed to the elements. Sidelap refers to the horizontal overlap between shingles in the same course, while toplap (headlap) is the vertical overlap where the upper course overlaps the lower course. Those terms describe how shingles overlap in other directions, not the visible distance between edges.

Exposure is the portion of a shingle that remains visible after installation. It’s the distance between the exposed edges of successive shingles, i.e., how much of the shingle you can see as you look along the roof. This measurement is set by how far the upper course overlaps the one below, and it determines how much of each shingle is exposed to the elements.

Sidelap refers to the horizontal overlap between shingles in the same course, while toplap (headlap) is the vertical overlap where the upper course overlaps the lower course. Those terms describe how shingles overlap in other directions, not the visible distance between edges.