PU injection grouting is a highly effective waterproofing technique that uses expanding polyurethane resin injected under pressure into cracks, joints, and voids in concrete structures. The low-viscosity liquid reacts with water or moisture, rapidly expanding into a flexible, closed-cell foam that seals active leaks permanently. Commonly applied in basements, tunnels, retaining walls,... https://shakuraconstruction.sg/pu-injection-grouting-singapore/