PU Injection Grouting Process: Step-by-Step Leak Stoppage PU injection grouting is a proven, minimally invasive technique for stopping water ingress. The process: 1) Identify leak sources via inspection or moisture mapping; 2) Drill small ports (packers) along cracks; 3) Seal surface and inject low-viscosity PU resin under controlled pressure; 4) Resin expands on water contact, curin... https://shakuraconstruction.sg/services/pu-injection-grouting/