head lap

Isaac Kremer/ November 23, 2025/ / 0 comments

The overlap of a roofing material, like a slate tile or shingle, on the course two rows below it, creating a watertight seal by preventing water from getting underneath. It is the distance from the upper edge of a lower course to the exposed surface of the next course up, and the correct head lap is crucial for weatherproofing the roof. The required head lap varies based on the roof’s slope, with lower slopes needing a greater overlap. (Kremer, 2025)

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About Isaac Kremer

IsaacKremer.com is the personal website of Isaac Kremer, MSARP, a nationally recognized leader in the Main Street Approach to commercial district revitalization with over 25 years of experience. Kremer, New Jersey's first certified Main Street America Revitalization Professional (MSARP), has served as founding executive director for organizations like Experience Princeton and the Metuchen Downtown Alliance, which won a Great American Main Street Award under his leadership. He recently became director of the Royal Oak Downtown Development Authority in Michigan.

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