Mapedrain 35 is a high-strength, three-dimensional drainage composite.  It consists of a woven filter fabric bonded to individual dimples of a molded polypropylene core, minimizing fabric intrusion into the drainage channels caused by overburden pressure. The filter fabric allows water to pass freely into the drainage core, which provides hydrostatic relief while preventing the passage of soil or sand particles that might clog the core. Mapedrain 35’s woven, monofilament fabric withstands high abrasion from applied overburden and prevents intrusion into the drainage core due to its low elongation characteristics. As such, the woven fabric is better suited to receive direct  poured concrete than nonwoven geotextile fabrics. Mapedrain 35 also has  a polymeric protective film on the back side to provide additional protection  to waterproofing membranes.