What is the primary purpose of a chalk line in roofing work?

• A. For alignment purposes.
• B. To measure roof pitch.
• C. To apply shingles.
• D. To seal around vent pipes.

Answer: (A)

Chalk lines are used to create straight, visible guides across the roof deck, so you can snap a line that runs parallel to the edge and use it to align each shingle course. This helps keep rows square and evenly spaced, making the starter course and all subsequent rows line up consistently as you work. It’s not meant for measuring roof pitch—pitch is determined with a level or pitch gauge—nor is it used to apply shingles or seal around vent pipes, which require other tools and steps.