Dura-Hold As a heavy duty interlocking retaining wall system, Dura-Hold is ideally suited for industrial and commercial landscaping, erosion control, protective facing and waterfront treaents. Dura-Hold face units and tiebacks produce the correct batter automatically to form a combination gravity and semi crib wall to a maximum height of 25 ft. If the site conditions are satisfactory, no footings are required. The standard units and tiebacks all interlock. Single standard units are placed at the rear between tiebacks for solid support. Tiebacks are aligned vertically in alternate courses in 8 ft centers. Under normal soil conditions, walls under 8 feet do not need tiebacks. Dura-Hold with it's setback interlocking system ensures proper inward lean throughout the height of the wall.