Dimple boards are typically made from High- Density Polyethylene (HDPE). They have a dimpled surface with raised areas, usually 8mm to 20mm deep. They are commonly black & brown in colour. Common Applications:- Basement Walls: Protecting waterproofing membranes on basement walls from backfill and ground water pressure.- Retaining Walls: Providing drainage and protection for retaining walls.- Foundation Slabs: Protecting foundation slabs from water damage and moisture intrusion.- Green Roofs: In some cases, dimple boards are used in Green Roof Construction to provide drainage and aeration.