What is a chalk line used for on a roof?

• A. A line made on the roof by snapping a taut string or cord dusted with chalk. Used for alignment purposes.
• B. A vertical measurement used to determine roof pitch.
• C. A tool for applying shingles to edges.
• D. A decorative chalk mark left after roof work.

Answer: (A)

A chalk line on a roof is a straight, visible guide that helps you keep shingles aligned. You snap a taut string or cord dusted with chalk to leave a crisp line across the surface, which serves as a reference for starting points and for keeping each course straight from eave to ridge. This makes rows consistent, edges clean, and the overall layout accurate as you install shingles. It isn’t used to measure roof pitch, it isn’t a tool for applying shingles to edges, and the chalk line isn’t a decorative mark left after work.