UltraSeal AB waterproofing membrane is a unique waterproofing membrane comprised of a polyethylene liner and an advanced Active Polymer Core (APC) layer integrally bonded to an aggressive pressure sensitive adhesive that locks the membrane to concrete. The active hydrophilic polymer APC layer swells and seals against water ingress while the aggressive adhesive bond to concrete prevents migration of water. Thus this advanced membrane combines two proven technologies into one membrane to provide excellent waterproofing performance.