Fibelastic APP M4.0 is elastomeric waterproofing membranes manufactured in an advanced continuous calendaring process by saturating and coating a synthetic carrier with a waterproofing compound made of a special grade of bitumen, which is modified with APP polymers. While the APP polymers enhance the thermal, mechanical, and aging properties of the membranes compound, the mechanical characteristics of Fibelastic APP M4.0 are established by the non-woven continuous filament spun-bond Polyester which acts as the reinforcement that provides the membrane with its particular tensile strength, tear resistance, puncture resistance and elongation properties. The upper surface of Fibelastic APP M4.0 is covered with an anti-adhesive finish material while the lower face is laminated with a thermo-fusible polyethylene film.