The retaining wall is made of packed tires stacked in a running-bond pattern to maximize interlocking between courses. Tires are filled with the earth taken out during the excavation stage, and non-biodegradable waste. There is a batter of 4” between each course of tires and the wall has a total height of 28’.

Nylon ropes are used once every three courses to tie the tires of a course together. Deadmen, made of rammed earth tires connected to the wall tires via nylon ropes, are added behind the wall at a regular spacing in order to enhance its resistance to the earth lateral pressure.

The space between the undisturbed soil and the tires is filled with sand. In order to drain, water goes through the sand before reaching a gravel trench at the bottom of the wall. A concrete drain tile lays in the trench and brings the water to perpendicular tiles crossing the wall at a regular spacing.