Installing Drainstone Backfill

What happens here

Following the explanation of the patio foundation, the presenter details the first layer of backfill directly behind the retaining wall. He indicates that this area, from the base up to approximately one course (layer) of the retaining wall blocks from the top, is filled with drainstone, which is a type of gravel. This stone provides a highly permeable layer for water to move through freely, preventing direct soil contact with the wall face and allowing for efficient drainage.

Goal: Create a permeable layer directly behind the retaining wall for effective water management.