Anti-fracture membrane, permanently elastic, resistant to static and dynamic cracks, to set up decoupling systems on horizontal and vertical structures in concrete, cement or wood finished with any kind of material in any dimension. Suitable for: indoors to set up floors on cracked screeds; for laying new coatings on existing flooring in domestic, commercial or industrial environments; suitable as an anti-fracture support for laying a wide range of materials, such as ceramics, also in a large format, porcelain stoneware, ceramic mosaics, glass mosaics, glass, natural stone, reconstructed stone, resilient materials (parquet, linoleum), plastic materials, wood, etc.