The retaining wall is made of two independent walls 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” for the wall made of bus tires but it reduces to 2” for the wall made of car tires.

For both walls, 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 drainage pipe made of plastic sheeting follows the slope of the trench and evacuates the water at the lower end of the retaining wall.