Polyurethane (PU) injection is a modern technique used in roof-repair-singapore for concrete slabs. This method involves injecting a specialized resin into cracks from the underside of the ceiling. The resin expands upon contact with moisture, creating a tight and durable seal. This is an excellent solution for high-rise apartments or areas where hacking the floor above is not an opti... https://kkroofspecialist.com.sg/roof-repair-singapore/