PU injection grouting is a leading non-destructive waterproofing method in Singapore, perfect for stopping active water leaks without hacking tiles or walls. The process injects low-viscosity polyurethane resin under high pressure into cracks, voids, or porous concrete. Upon contact with water, the hydrophobic PU expands rapidly (up to 20–30 times) into a flexible, closed-cell foam th... https://shakuraconstruction.sg/services/pu-injection-grouting/