All four modules and parapet retaining walls are finished. We will wait 30 days to begin backfilling. The area to be backfilled will be coated with spray on waterproofing (resembles spray on pickup bed liner when dry) then sheets of dimpled plastic membrane. The dimpled plastic has wicking material on the outside which picks up moisture that travels through the ground and conducts it to the french drain at the bottom of the wall for drainage away from the house. Then soil is backfilled against the membrane.