What does a bed joint primarily do in a masonry wall?

A bed joint primarily serves the purpose of joining blocks horizontally in a masonry wall. This joint is the horizontal layer of mortar that sits between two courses of masonry units, such as bricks or concrete blocks. By providing a stable, level surface for the units placed above it, the bed joint helps to distribute loads evenly and contributes to the overall strength and rigidity of the wall.

Understanding the role of a bed joint is crucial for effective masonry construction, as it not only aids in maintaining structural integrity but also impacts the alignment and appearance of the wall. Properly executed bed joints ensure that the masonry units are securely bonded and can perform their intended function, which is vital in any masonry work.