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INSTALLATION GUIDELINES
  

STEP 1: PREPARE WALL BASE
 
Figure the location, length and elevation of the wall. Excavate base trench approximately 9" deep and 60" wide. Using 1/2" ­ 3/4" crushed stone, recycled concrete or gravel, compact to 95% Standard Proctor or greater. Always start wall base at the lowest elevation of the wall. Keep in mind that LondonBoulder units can be directly off-loaded from the delivery boom truck if desired. However, this can be time consuming and costly if wall base is not adequately prepared.

STEP 2: INSTALL THE BASE COURSE
 
Place and level each base course unit, making sure unit is level from side to side, front to back, and with adjacent units. The base course is critical for achieving desired results. Take time accordingly.

STEP 3: DRAIN PIPE INSTALLATION
 
Install a 6" wrapped, perforated drainpipe behind the base course and along the full length of the wall. Surround drainpipe with 1 sq. ft. of drain stone.

STEP 4: BACKFILL

Use 3/4" to 1" free-draining, angular, granular fill to a width of 6" behind the wall. Compact to a 95% density. Round rock and pea-gravel should not be used.

STEP 5: INSTALL ADDITIONAL COURSES

Clear all rock and debris from the top of each row before installing next course. Position additional courses upon preceding layer, straddling the two lower units and staggering the vertical joints.

*NOTE FOR PARTITION WALLS:

If installing a partition wall, a definite pattern must be used. This requires that the installer adhere to a specific set of wall lengths as determined by full-unit increments. All partition walls should have a base course consisting of full and full-corner LondonBoulder units. The second course will consist of full units encased by a half-corner block on one end and a 2/3-corner block on the other. All subsequent rows will repeat the pattern created by the first two courses. Please contact your LondonBoulder salesperson with any questions.

*NOTE: FOR WALLS GREATER THAN 9¹ TALL, PLEASE CONSULT A CERTIFIED ENGINEER.

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