What is the name for the distance from the lower edge of a top shingle to the upper edge of the shingle in the course immediately below it?

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Prepare for the California Roofing Contractor Exam. Utilize flashcards and multiple choice questions with helpful hints and explanations. Boost your confidence and ace the exam!

Multiple Choice

What is the name for the distance from the lower edge of a top shingle to the upper edge of the shingle in the course immediately below it?

Explanation:
Headlap is the vertical overlap between successive courses of shingles. It’s the distance from the lower edge of the top shingle down to the upper edge of the shingle below it. This overlap helps seal the seam and directs water off the roof. Sidelap is the horizontal overlap between shingles in the same course, exposure is how much of a shingle remains visible after installation, and toplap isn’t the standard term for this vertical course-to-course overlap.

Headlap is the vertical overlap between successive courses of shingles. It’s the distance from the lower edge of the top shingle down to the upper edge of the shingle below it. This overlap helps seal the seam and directs water off the roof. Sidelap is the horizontal overlap between shingles in the same course, exposure is how much of a shingle remains visible after installation, and toplap isn’t the standard term for this vertical course-to-course overlap.

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