The distance from the lower edge of a top shingle to the upper edge of the shingle two courses below is called

The distance from the lower edge of a top shingle to the upper edge of the shingle two courses below is called

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

Answer: (A)

The concept here is how shingles are stacked to create a weatherproof cover. When you place shingles in courses, each upper shingle overlaps the ones below by a certain amount. The specific distance described—from the bottom edge of the top shingle to the top edge of the shingle two courses down—is the headlap. It’s the vertical overlap that the upper row provides over the row two courses below, helping to stagger joints and seal against water and wind. Toplap refers to the overlap with the shingle in the course directly below, exposure is how much of a shingle is visible, and sidelap is the horizontal side-to-side overlap within a course.

The concept here is how shingles are stacked to create a weatherproof cover. When you place shingles in courses, each upper shingle overlaps the ones below by a certain amount. The specific distance described—from the bottom edge of the top shingle to the top edge of the shingle two courses down—is the headlap. It’s the vertical overlap that the upper row provides over the row two courses below, helping to stagger joints and seal against water and wind.

Toplap refers to the overlap with the shingle in the course directly below, exposure is how much of a shingle is visible, and sidelap is the horizontal side-to-side overlap within a course.