Nordpoly 4B XP (smooth) is a 4 mm thick, APP modified bitumen waterproofing membrane reinforced with a nonwoven spunbond polyester carrier.
The top surface is covered with a unique polypropylene black felt and the underside is covered with a printed burn off polyethylene film for torch application. The diamond embossed surface provides great adhesion to the substrate during the torching process, while the XP felt on the top allows the application of a protective coating almost immediately after the torch operation*. (*The unique XP black felt surface can accept a protective paint coating once the membrane has been allowed to cool down after torching).
Nordpoly 4B XP is FM Approved. Nordpoly 4B XP meets or exceeds the criteria for ASTM D 6222, Type I, Grade S.