Sisalation is a reinforced aluminium foil insulation material, made from a lamination of aluminium foil, kraft paper, reinforced synthetic fibre and polyethylene. It is used in factories, warehouses, schools, hospitals and commercial and residential dwellings. Sisalation reduces heat gains in summer and contains heat losses in winter. The material also acts as a waterproofing membrane when used under roof tiles. Sisalation has a high light reflectivity. When installed in industrial building as an exposed internal roof lining, the reflectivity of the foil will enhance the lighting of the building.