When dealing with inter-floor seepage, PU injection grouting is the gold standard for ceiling leak repair. This "no-hacking" method involves injecting high-pressure polyurethane resin into concrete cracks, where it expands to create a flexible, waterproof seal. It is a fast, clean, and highly effective way to stop leaks in HDB toilets, balconies, and kitchens without the need for mess... https://shakuraconstruction.sg/ceiling-leak-repair/