STEP 3 . INSTALL THE FIRST LAYER
You must ensure the first layer is perfectly level. Place the blocks onto the base and tap with rubber mallet. As you lay the first layer – check that it is level from side to side and back to back. Check the back of the first layer with string line. On a sloping site, step the trench in 100mm increments to ensure blocks remain level. Always start laying your wall from the lowest point and work uphill.