Powerlon Metalix SA is a heavy duty breathable roof felt designed for copper, zinc and metal roofs. The multilayer breathable membrane has a 3D top layer which reduces the build-up of moisture and noise levels. This self-adhesive separation layer has edge strips with a peel-off back for strength and durability. Powerlon Metalix SA is a waterproof CE-marked fully vapour permeable product that offers both thermally insulating and acoustically insulating properties. The 9mm thick breather membrane weighs 450gsm and has a nail tear strength of MN >160N/50mm and XD >210N/50mm. Powerlon Metalix SA Breather Membrane Specifications Length: 25m. Width: 1.5m. Weight: 450gsm. Colour: Black/Grey.