In PU injection grouting, a specialized polyurethane-based chemical is pressure-injected directly into leaking cracks, construction joints, or porous concrete to create an impermeable seal from within. The grout, available in foam (for instant water stoppage) or resin (for structural reinforcement) variants, reacts chemically—expanding rapidly to fill every gap and pushing out water w... https://shakuraconstruction.sg/pu-injection-grouting-singapore/