Step 1: Determine Wall Layout
Prior to excavating, lay the first course of Mosette units in the desired configuration to help determine the path of your wall. Mark an area 6 inches out from all sides of the wall (approximately a 20-inch width). This is the area that will be excavated.
Step 2: Excavate Trench
Excavate the marked area to a depth of 7 inches. This depth will allow room for a 4-inch-high compacted granular leveling pad and a 3-inch embedment of the first course. If necessary, overexcavate soft foundation soil and replace it will properly compacted backfill. Use a hand tamper or vibratory plate compactor to compact the base of trench.
Step 3: Build Leveling Pad
Place granular leveling-pad material in the trench and compact it to a smooth, level surface until approximately 4 inches deep. Place and compact no more than 2-inch thicknesses at one time if using a vibratory-plate compactor. Leveling-pad material should consist of coarse-grained sand, gravel, or crushed stone. Aggregate used locally for road base usually is acceptable. You can spread a thin layer of sand on top (1/2 to 1 inch) to help with Mosette leveling.
Step 4: Place, Level and Backfill Base Course
Place the first (or "base") course of Mosette units on the leveling pad. As you proceed, level each unit front to back, side to side, and with adjacent units. You can adjust the sand layer or use a rubber mallet to help with unit leveling. Where a 12-inch-high vertical unit is placed next to 6-inch-high units in the base course, you may find it helpful to temporarily set additional 6-inch-high units for the next course so you can level across the vertical unit. After the first course of Mosette units is installed, backfill the open trench areas with desired soil and compact. Take care not to displace units during compaction.
Step 5: Place and Glue Succeeding Courses
Prior to applying adhesive, test position your next course of Mosette. Align units to create a vertical wall and do your best to stagger unit joints from course to course for improved wall strength. When you are satisfied with the unit arrangement, set aside the temporarily placed units, preserving their order. Sweep off any debris on installed Mosette units. Spread a ¼ -inch bead of VERSA-LOK Concrete Adhesive in a wavy pattern of the top surface of installed units. Replace "tested" Mosette units on the adhesive. Repeat with remaining courses. Remember, the Splitting Wall Units for wallexposed height of a Mosette freestanding wall (including the height of cap units) should not exceed 24 inches.
Step 6: Place and Glue Cap Units
If desired, VERSA-LOK cap units can be used to finish the top of your Mosette wall. To create the proper 10-inch depth, split the rear 2 inches off using a masonry chisel and heavy mallet or rented mechanical splitter. Caps are tapered on both sides. Like Mosette units, caps can be arranged to create straight and curved configurations. Glue cap units to the wall using VERSA-LOK Concrete Adhesive.