TamSeal 2000 is a high performance HDPE preformed membrane for upwards bonding to concete. It is designed for underground structures such as tunnels and basements. Its advanced technology sets it apart from other preformed membranes. TamSeal 2000 is a composite sheet comprising of a HDPE film and an adhesive that will react with wet mortar to provide a superior bond. TamSeal 2000 is a fully bonded waterproofing membrane that bonds directly to concrete, thus sealing the concrete and preventing any ingress of water around the structure.