What is the primary purpose of a mason's line?

The primary purpose of a mason's line is to keep walls in true alignment. This tool, typically a strong string or line, is used to establish a straight reference point for laying bricks or blocks. When building structures, it's crucial that each course of masonry is aligned both horizontally and vertically to ensure the integrity and aesthetic appeal of the finished wall.

By pulling the mason's line taut between corners or points, masons can accurately gauge if the bricks are being laid in a straight line and at the correct height relative to the previous courses. Maintaining true alignment is essential for load distribution, preventing structural issues, and achieving a professional appearance. While it can assist with other tasks, such as marking angles indirectly, its primary role directly supports the alignment and level of the masonry work, which ultimately leads to a sturdy and visually pleasing finish.