About Construction Polythene Film LDPE Film (Membrane) are installed for several purpose as below to control or reduce the passage of moisture as a separating layer to accommodate differential movements. To accomplish these takes, membranes should be resistant to moisture and capable of resisting rot and decay. ldpe film, polyethylene film, low density polyethylene film, construction polyethylene filmApplications Concrete Road/ Highway Airport Runways Swimming Pool Bunkers Terrace