Aluthermo Quattro is the first thin, multi-reflector, multi-layer insulation system with all surfaces fully thermally welded together. Aluthermo Quattro is composed of two layers of pure aluminium 30 microns thick, polished and treated against oxidation, separated by two layers of air bubbles placed in a honeycomb structure and enclosed in a fire-retarding polyethylene film, as well as two additional films of pure aluminium and a waterproof and fire-retardant polyethylene foam. Aluthermo Quattro constitutes an almost impenetrable barrier for infrared radiation in both summer and winter. Properties Length: 6.25m. Width: 1.25m. Roll size: 7.5m2. Thickness: 10mm. Thickness of polythene film: 150 microns. Weight: 750gsm. Guarantee: 10 years. Application As roof insulation from the exterior. As roof insulation from the interior. For wall insulation from the exterior. For wall insulation from the interior. For floor insulation.