Modern roof leakage repair has evolved beyond messy, noisy hacking. For concrete flat roofs common in HDBs and condos, PU Injection Grouting is a popular "no-drill" solution. This involves injecting a specialized polyurethane resin into cracks; the resin expands upon contact with moisture to create a total seal. It’s fast, clean, and highly effective for stopping active leaks from the... https://shakuraconstruction.sg/services/roof-leakage-repair/