Decor Precast

Installation Guide - Walls

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Step 1

Excavation

Dig a trench. The excavation depth must take into account the 150 mm (6”) depth of the foundation as well as the buried depth of the modules or of the first row of modules. Take into consideration that 10% of the height of the wall should be buried. The width of the trench will depend on the type of block selected. However, you must allow for a trench of at least 300 mm (12”) in width to construct a drainage system with clean stone behind the wall.

Step 2

Preparation Of The Base

Cover the back and the bottom of the trench with a geotextile membrane to prevent the soil from obstructing the drainage system. This geotextile membrane should project about 300 mm (12’) beyond the top of the slope.

Step 3

Foundation

Prepare a 150 mm (6”) foundation of 20-0 mm (0-3/4”) crushed stone (in the case of clay soils, it is strongly recommended to increase the depth of the excavated areas) and compact using a jumping jack or a vibrating plate. Then install a 102 mm (4”) diameter perforated drain on the foundation and connect it to the existing drainage system. This drain will be covered with 20 mm (3/4”) crushed stone in step 5.

Step 4

Installing The First Row

Step 5

Backfilling The Wall

Fill the space behind the blocks with clean stone of 20 mm (3/4”). Pack down lightly.

Step 6

Installing additional rows

Install additional rows. Backfill the wall (step 5) approximately every 200 mm (8”). Use capping modules to top off your wall (if available for the type of retaining wall chosen).We recommend the use of a concrete glue to secure them. Finishing: Cover the clean stone with the excess geotextile membrane in order to avoid contamination of the drainage system with soil. Fill and level the soil behind the last row of blocks to complete the job.