Final answer:
A standard mortar joint can vary in size, but newer construction practices suggest it may be as large as 8 diameters side-to-side and 15 diameters deep, although actual size will depend on project specifications, masonry units, and applicable building codes.
Step-by-step explanation:
The question relates to the construction field of engineering, specifically regarding the size of a standard mortar joint. The diameter of a standard mortar joint can vary depending on the application and era of the construction practices. An older "rule of thumb" suggested mortar joints to be 5 diameters side-to-side and 7-8 diameters deep.
However, more recent approaches advise that mortar joints may be as large as 8 diameters side-to-side and 15 diameters deep to ensure structural integrity and proper bonding. It's essential to consider that these dimensions can differ based on the specifications of the project, the type of masonry units being used, and the building codes applicable to the area where the construction is taking place.