Which item is used to mark a straight line for alignment in construction?

A chalk line is a critical tool in construction used to mark straight lines over long distances, ensuring proper alignment for various projects, including roofing. It consists of a string coated with chalk that, when snapped against a surface, leaves a clear chalk line. This method is precise and efficient, allowing contractors and builders to create accurate guidelines for cutting materials, aligning sections, or placing fasteners.

Using a chalk line provides better visibility and accuracy than relying solely on a measuring tape or ruler, especially on larger surfaces where maintaining a straight edge can be cumbersome. This tool is especially valuable in roofing, where precise alignment is vital to ensure the integrity and aesthetic of the finished product.

Other options, while relevant in construction, do not fulfill the purpose of marking straight lines for alignment. Chase refers to a groove or cut made in masonry, cement is a building material, and a ceiling joist is a structural component. None of these serve the specific function of marking a straight line in the way a chalk line does.