PU injection grouting is a highly effective waterproofing technique that uses expanding polyurethane resin to seal cracks, joints, and voids in concrete structures. The low-viscosity liquid is injected under high pressure into leaks or damaged areas, where it reacts with water or moisture to rapidly expand (up to 20-30 times its volume) and form a flexible, closed-cell foam seal. This... https://shakuraconstruction.sg/pu-injection-grouting-singapore/