Ceiling Water Droplets, Peeling Paint, and Mould?
Few issues cause more household distress in high-density Singapore apartments than an inter-floor water leak. You walk into your bathroom, and water is continuously dripping from the ceiling concrete slab or down the sanitary waste pipe. The traditional solution—hacking up the upstairs neighbor's floor tiles—is loud, dirty, disruptive, and often sparks painful neighbor disputes.
Fortunately, modern structural engineering provides a proven, non-destructive alternative: High-Pressure Polyurethane (PU) Chemical Injection Grouting.
How High-Pressure PU Injection Works
Polyurethane injection grouting is a cutting-edge technique that stops active water leaks directly from the bottom (your ceiling), eliminating the requirement to hack the upper floor:
- Thermal Camera Diagnosis: A FLIR infrared camera scans the ceiling to map moisture patterns and trace the primary crack fissures behind the paint.
- 45-Degree Port Drilling: Specialized mechanical injection packers (brass ports) are drilled at an angle to intersect the water-bearing concrete fissure inside the slab.
- High-Pressure Hydrophobic Injection: A motorized pump forces hydrophobic liquid PU resin through the packers under 2,000+ PSI pressure deep into the interior capillaries of the slab.
- Expansive Reaction: As soon as the liquid resin contacts moisture, it rapidly reacts, expanding up to 25 to 30 times its volume into an impenetrable, flexible closed-cell rubber barrier that permanently seals the void.
- Clean Finishing: The ports are detached, holes plugged with high-strength non-shrink grout, and the ceiling is coated with anti-mould paint.
🏆 Key Advantages of PU Injection
- Zero Hacking: Upper floor tiles and bathroom vanities remain completely undisturbed.
- Speed: Most repairs take just 3 to 5 hours to complete.
- Flexible Durability: PU cures into a flexible foam that withstands building vibration and thermal expansion without cracking.
- Cost-Effective: Up to 60% cheaper than total bathroom floor hacking and re-tiling.
Is PU Injection Approved by HDB?
Yes. Under the HDB Goodwill Partner Assistance scheme for inter-floor leaks, PU chemical injection is officially recognized as an approved repair method. Tabeeb Contractor provides full documentation, before-and-after thermal reports, and written warranty coverage.