| PU Injection Grouting in Singapore (also known as polyurethane injection grouting or PU grouting) is a leading non-hacking waterproofing technique widely used to permanently seal cracks, joints, voids, and active water leaks in concrete structures. It’s especially popular in Singapore’s humid, rainy tropical climate for addressing issues in HDB flats, condos, landed homes, basements, bathrooms, rooftops, balconies, ceilings, and commercial buildings—preventing ceiling stains, mold, structural weakening, and costly damage without major demolition.
This method injects a low-viscosity polyurethane resin under pressure into leaks; the resin reacts with water, expands (foams), and hardens into a flexible, watertight seal that bonds strongly to concrete.
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