Elasto-plastomeric prefabricated waterproofing membrane whose compound is composed of distilled bitumen, plastomers, elastomers & polyolefin’s (APAO) obtained from Metallocene catalysis polymerization, with molecular weight and selected tacticity. The membrane is reinforced with a woven non woven single strand composite spunbond polyester fabric, offering very high mechanical characteristics and excellent dimensional stability. The waterproofing compound has a special inorganic and non toxic additive which confer to the product a flame retardant action.