External Waterproofing Membrane Double Drain (2m x 15m Roll)

Double Drain is a vertical drainage layer for external basement walls and a protection board to primary membranes. It consists of an impermeable studded sheet, manufactured from highdensity polyethylene with a polypropylene filter fabric bonded to the top of the surface of the studs. Channels between the studs form an air gap against the underlying structure.  Double Drain forms drainage layers on both sides of the studded core sheet. The filter fabric facing the backfill material ensures the drainage channels are not blocked or obstructed. Installation A) Double Drain can be fixed vertically or horizontally to suit he application. B) Double Drain must be installed over a primary membrane, such as brushed on bitumen coatings. Fix Double Drain along the top edge above the primary membrane, with Double Drain cramps at 250mm centres. C) Cover vertical joints by 500mm and horizontal joints by 150mm. Filter fabric can be pulled back for successive overlap of the membrane and filter fabric. D) Fix Platon Top Edge Moulding along the tope edge of the membrane to avoid debris or backfill material from blocking the drainage channels. E) Ensure adequate drainage from Double Drain to drainage pipes.