What is the limit on mortar projection over a masonry joint?

The correct answer regarding the limit on mortar projection over a masonry joint is indeed 1/2 inch. This is grounded in the principles of masonry construction to ensure both aesthetic appearance and functional performance.

Mortar is designed not only to bond masonry units but also to accommodate movement and expansion, and a mortar joint that projects excessively can lead to problems. If the mortar extends too far beyond the masonry joint, it can compromise the structural integrity and durability of the wall. There are practical reasons for this limit: excessive mortar may crack or deteriorate over time due to environmental factors and will not adhere properly to the units.

The 1/2 inch limit strikes a balance between providing enough mortar for an effective bond and avoiding potential issues associated with excess. Adhering to this standard helps maintain uniformity in appearance and ensures the masonry work meets building codes and standards for safety and durability.