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 into flexible foam, and seals active leaks permanently. Ideal for basements, retaining walls, tunnels, and ceilings, it stops water seepage without hacking or maj... https://shakuraconstruction.sg/pu-injection-grouting-singapore/