Sheet-Applied Waterproofing Membrane TREMproof® Amphibia™ waterproofing membrane is self-healing, self-sealing and self-repairing. It has three active layers - a watertight EPDM barrier, an active core with the ability to seal when penetrated and an active barrier which seals the overlap and helps resist lateral movement of water. Also, a non-woven fabric layer promotes the mechanical adhesion of the membrane to the concrete. TREMproof® Amphibia™ waterproofing membrane is designed for use over lagging on blindside walls, below-grade walls, pile caps, grade beams, under slab and buried forms such as elevator pits.