PU injection grouting is a highly effective waterproofing technique that injects expanding polyurethane resin into cracks, voids, and joints in concrete structures. The low-viscosity liquid reacts with water, rapidly expands (up to 30x volume), and forms a flexible, closed-cell foam seal. Ideal for stopping active leaks in basements, retaining walls, tunnels, and ceilings without majo... https://shakuraconstruction.sg/pu-injection-grouting-singapore/