POLIGUM RIFACIMENTI is a prefabricated composite waterproofing membrane with different masses, designed to renew old waterproofing membranes self-protected with mineral slates. The waterproofing mass of the upper and intermediate surface is based on distilled bitumen, modified with elastoplastomeric polymers and reinforced with "non woven" spunbonded polyester fabric stabilised with glass fibres, with excellent mechanical characteristics, dimensional stability and durability. The application side is composed of distilled bitumen and special polymers that ensure particular adhesion and workability features. A particular specially designed waterproofing mass is used to compatibilise the upper surface waterproofing compound with that of the lower surface.