Protect A1 can be used for all pitched roof constructions (tiled and slated), whether the insulation is at ceiling joist level or at rafter level. It is a twin-ply construction of polypropylene non-woven spunbond layer and PP film. Protect A1 is a third-generation roofing underlay which has been developed specifically to overcome the disadvantages of traditional Type 1F felts and second generation plastic sheet materials. Please note this product does not require the joints & laps to be taped but must be battened correctly. Properties Length: 30m. Width: 1.5m. Roll size: 45m2. Roll weight: 7kg. Weight: 145gsm. Brand: Protect. Features Completely waterproof. Can be used as a temporary roof covering. Excellent nail tear strength and tensile strength. Has unrestricted use for wind uplift in all exposure conditions in the UK and Ireland. Suitable for use in zones 1-5 at 345mm batten gauge. UV and heat stable. Absorbent undersurface prevents condensate drip-off. Embossed dark grey upper surface reduces glare and takes a chalk line marking. Does not generate noise under wind gusting. Easy to cut, clean, light to handle and unaffected by temperature changes.