What type of alignment does 'plumb' ensure in masonry?

The term 'plumb' specifically refers to the vertical alignment of structures in masonry work. When a structure is described as plumb, it indicates that it is perfectly perpendicular to the ground, ensuring that walls and other vertical elements are erect and true. Achieving plumb is essential for maintaining structural integrity and aesthetics in construction, as any deviations can lead to problems such as uneven settling or structural weaknesses.

While horizontal alignment involves ensuring that elements are level, and diagonal alignment might relate to specific design angles, the concept of plumb is solely focused on the vertical aspect. Custom alignment based on design could refer to various orientations depending on architectural requirements, but 'plumb' distinctly applies to ensuring vertical accuracy. Thus, understanding and maintaining plumb is critical for successful masonry projects.