PU Injection & PU Grouting
Singapore
Professional polyurethane (PU) injection seals active water leaks in concrete structures by filling cracks and voids with expanding waterproof resin. Ideal for leaking walls, ceilings, basements, lift pits, retaining walls and underground structures.
PU Injection, also known as polyurethane grouting, is a non-destructive waterproofing method that injects expanding polyurethane resin into leaking cracks and joints.
When the resin comes into contact with water, it expands rapidly to fill gaps and create a waterproof barrier that stops water infiltration.
Unlike conventional waterproofing, PU injection targets the exact leakage path without removing large sections of walls or floors.
What is PU Injection?
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Traditional repairs often involve hacking tiles or concrete.
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PU injection offers several advantages:
✅ Minimal hacking
✅ Fast installation
✅ Targets hidden leaks
✅ Flexible waterproof seal
✅ Suitable for active leaks
✅ Long-lasting repair
✅ Cost-effective
Why Choose PU Injection?
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Step 1 – Leak Inspection
Our specialists inspect the affected area to determine the exact source of water ingress.
Step 2 – Install Injection Packers
Small injection ports are installed along the crack or leaking joint.
Step 3 – Inject PU Resin
High-pressure pumps inject polyurethane resin into the crack.
When the resin contacts water, it expands to completely fill internal voids.
Step 4 – Waterproof Barrier
The expanded resin forms a flexible waterproof seal that blocks future water penetration.
Step 5 – Remove Packers
Injection ports are removed and the surface is patched neatly.
How PU Injection Works
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FAQs
Can PU injection repair active water leaks?
Yes. PU injection is specifically designed to stop active water infiltration by expanding inside cracks and creating a waterproof seal.
Is hacking required?
Most PU injection repairs require little or no hacking, making it one of the least disruptive waterproofing methods
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Is PU injection suitable for HDB flats?
Yes. PU injection is widely used for HDB, condominium, landed, commercial and industrial buildings throughout Singapore.
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Accurate Detection. Targeted Repair. Long-Lasting Results.
Every successful waterproofing repair starts with identifying the true source of the leak. Using thermal imaging technology, we pinpoint hidden moisture before carrying out targeted PU injection to seal cracks from within the concrete. This non-destructive approach minimises unnecessary hacking, shortens repair time, and delivers a durable waterproof barrier.
✅ Non-invasive leak detection
✅ Targeted PU injection repair
✅ Clean finish with minimal disruption
Frequently asked questions
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