PU injection grouting is a popular non-hacking method used in roof-repair-singapore for concrete roofs. This involves injecting polyurethane resin into cracks in the concrete slab. The resin expands upon contact with moisture, filling the void and creating a waterproof seal from within. This method is highly effective for stopping active leaks without the need for extensive demolition... https://kkroofspecialist.com.sg/roof-repair-singapore/