Water Proofing

PU injection and grouting is a common approaches for preventing water leaks. PU is an abbreviation for polyurethane, which has a hydrophobic property. It is commonly used to repair cracks in concrete and honeycomb concrete by pressing the chemical into the faulty regions. When PU (polyurethane) is exposed to water, the chemical reacts, swells, and foams, sealing the concrete pores and fissures. The PU can expand up to 20 times the volume injected.