Waterproofing membrane consisting of an inner layer of polyethylene coated on both sides with non-woven polypropylene fabric, ensuring perfect adhesion and stability of cementitious adhesive, maximizing cohesion between membrane and substrate, and excellent stability of the overlying flooring. Anti-fracture fabric for securing floorings against micro-cracked or not perfectly cured subfloors. It allows decoupling screed joints from flooring expansion joints, ensuring continuous tiling free from cuts necessary to respect underlying screed fractional joints. Product for professional use.