Sika Drainage Mat 720 4' X 50' Roll

4' x 50' x 0.4" Roll, Drainage Mat

Sika® Drainage Mat 420 and 720 consist of an impermeable high flow dimpled polypropylene drainage core heat-bonded to a layer of non-woven polypropylene (420) or woven polypropylene (720) filter fabric on the top side and a polyethylene membrane protection film on the bottom side. The filter fabric retains soil or sand particles as well as freshly placed concrete or grout, allowing filtered water to pass into the drainage core. Use the nonwoven filter fabric with soil, sand or stone ballast; use the woven filter fabric with freshly placed concrete or grout.