Dimpled Sheet

Dimpled membranes are one of the most versatile and effective drainage products on the market. Invented in the mid-1960s, they can be used for nearly every drainage situation imaginable.
Dimpled drain sheets are used on everything from small residential basements to enormous commercial projects extending 50 feet below grade. They can even be used horizontally.
This product has been used for green roofs, planters, plaza decks, parking garages, retaining walls, residential foundations, commercial and blindside work.
The key to dimple membranes’ versatility lies in their elegant simplicity. Most consist of a polypropylene or high-density polyethylene (HDPE) sheet, molded into a series of raised knobs, or dimples.
The dimple height, sheet thickness, and compressive strength vary. Many have a non-woven geotextile bonded to the dimple side of the membrane that acts as a soil filter, and it’s common for them to be perforated, or “needle punched,” to allow moisture to penetrate.