PU injection grouting is an advanced pressure grouting system using polyurethane to repair and waterproof concrete structures suffering from leaks or voids. Holes are strategically drilled near defects, packers installed, and low-to-high viscosity PU grout pumped in—where it penetrates deeply, reacts with moisture, and expands to form a tough, flexible foam or gel barrier that seals a... https://shakuraconstruction.sg/pu-injection-grouting-singapore/