Hydroactive Polyurethane Grouts are used for varied waterproofing needs. They are injected into the leaking structures and react with water to form expanding closed cell foam filling voids and penetrating cracks and fissures. These are used to stop leakage through cracked or honeycombed concrete, voids, expansion joints and pipe intrusions. It is also recommended for use in tunnels, manholes, sewer lines, tanks, dikes and dams.