What is the primary purpose of stringing out block of the first course without mortar?

The primary purpose of stringing out blocks of the first course without mortar is to ensure proper size joint and modular layout. This practice allows masons to visualize and verify the layout before any permanent fixing occurs. By doing so, they can check for consistency in joint sizes and confirm that the blocks fit together according to the design specifications.

Stringing out helps in identifying any necessary adjustments to the block placement that may be needed to maintain a straight and level line throughout the course. It also allows for the assessment of alignment with other architectural features, ensuring that the final construction meets aesthetic and structural requirements. If any adjustments are needed, they can be easily made without the complications that arise once mortar has been applied. The focus on modular layout also facilitates ease of work when the blocks are eventually mortared in place, ensuring a uniform appearance and structural integrity.