In PU injection grouting, a two-component or single-component polyurethane resin is injected under controlled pressure to repair leaking structures. The process involves drilling small ports, installing mechanical packers, and pumping the grout, which expands upon contact with water to fill voids completely and create an impermeable barrier. Widely used for stopping seepage in undergr... https://shakuraconstruction.sg/pu-injection-grouting-singapore/