For persistent cracks in ceilings or walls, our PU injection waterproofing solutions in Singapore offer a high-pressure fix that stops leaks at the source. Polyurethane (PU) resin is injected into concrete cracks, where it expands upon contact with moisture to form a permanent, flexible seal. This "negative side" waterproofing is ideal for inter-floor leaks in high-rise buildings and ... https://shakuraconstruction.sg/services/psb-certified-fire-rated-partition-wall-ceiling/