Pre-fabricated waterproofing membrane made of distilled bitumen and special polymers (SAP type) having a woven non woven single strand composite polyester reinforcement, which provide the membrane with good mechanical characteristics and excellent dimensional stability. The lower face of the membrane is finished with a PE film with striped embossing. The latter has the function of optimizing and maximizing adhesion of the membrane to the laying surface during hot application: respect at a traditional embossing, the surface is more uniform. The thousand lines per square meter operate a uniform marking and close-up of the PE film thus ensuring a homogeneous opening in the phase of application, obtaining the maximum adhesion to the application plan. Striped embossing facilitates the operator during the flaming because it requires less flame intensity and therefore less absorption of heat from the product itself, eliminating the problems of “Footprints” that occur on the upper face of the both smooth and slated products.