PU injection grouting is a top non-hacking waterproofing solution in Singapore for stopping active leaks in HDB flats, condos, and commercial buildings. Also called polyurethane grouting, it involves drilling small holes and injecting expanding PU resin under pressure into cracks, voids, or joints in concrete slabs, ceilings, walls, or bathrooms. The foam expands on contact with water... https://shakuraconstruction.sg/services/pu-injection-grouting/