This is used to restric or act as a barrier to the movement of underground water or moisture by capillary action through walls and floors of buildings.
It is 500 microns thick, that's 0.5mm or 2,000 gauge with both surfaces rough, to provide a key for the bonding of mortar.
Available are; 6" (150mm x30m), 9" (225mm x30m), 12" (300mm x30m) and 12" (300mm x25m)
Their respective prices are;