To ensure half-lap running bond, which joints should align plumb on alternate courses?

To ensure a half-lap running bond in masonry, it is essential that the head joints align plumb on alternate courses. In this type of bonding pattern, each course is staggered such that the vertical joints do not line up, creating a more stable and aesthetically pleasing wall.

When the head joints—those that are located at the ends of the brick—are lined up vertically on alternating courses, it allows for a stronger bond by distributing the load more evenly across the wall. This technique helps enhance the wall's structural integrity and increase its resistance to cracking and shifting.

Ensuring proper alignment of the head joints is crucial for maintaining the intended visual appearance of the masonry, as well as ensuring that the masonry adheres to best practices for durability and stability.