ALFA EXTRA PRO is a waterproofing prefabricated membrane made of distilled bitumen and polyolefin elastoplastomeric polymers (APAO), reinforced with a woven non woven single strand composite spunbond polyester fabric, stabilized with fibreglass, having excellent mechanical characteristics as well as dimensional stability. The waterproofing compound has a special inorganic and non toxic additive which confer to the product a flame retardant action.