Install and Level First Course of Blocks

What happens here

The first course of interlocking concrete blocks is the most critical for the entire wall's stability and appearance. Each block is placed onto the compacted angular rock base. A string line is tensioned along the *back* (the machine-faced side) of the blocks. This is a key technique to ensure a perfectly straight wall, as the split-faced front can have natural undulations. Each block is individually leveled both front-to-back and side-to-side using a short level, and then leveled relative to the adjacent blocks using a longer (four-foot) level. A rubber mallet is used to gently tap blocks into their final level and position. This process guarantees a perfectly aligned and level foundation for subsequent courses.

Goal: The first course of interlocking concrete blocks is carefully placed and meticulously leveled, using a string line along the back (machine-faced side) of the blocks for perfect alignment and a rubber mallet for adjustments.