Nordpoly 4B (smooth) is a 4 mm thick, APP modified bitumen waterproofing membrane reinforced with a nonwoven spunbond polyester carrier.
The top surface is covered with sand and the underside is covered with a printed burn off polyethylene film. The diamond embossed surface provide excellent adhesion when the roll is torched to an acceptable substrate.
Nordpoly 4B is FM Approved, Miami Dade and Florida Building Code Approved. Nordpoly 4B meets or exceeds the criteria for ASTM D 6222, Type I, Grade S.