PU Injection (Polyurethane Injection) is a specialized leak repair method used to stop active water seepage in concrete structures. At J & G Waterproofing Leaking Specialist Services, we provide professional PU injection crack repair in Terengganu to permanently seal leaking cracks in walls, slabs, basements, and concrete structures.
We don’t just cover cracks — we seal them internally at the source.
When Is PU Injection Required?
PU injection is commonly used when there is:
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Active water leakage from wall cracks
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Basement seepage under hydrostatic pressure
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Concrete slab water infiltration
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Lift pit leakage
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Retaining wall seepage
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Underground structure cracks
It is especially effective for structural cracks that leak during heavy rain, which is common in Terengganu’s climate.
Common Signs You Need PU Injection
If you notice any of the following, professional inspection is recommended:
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Water dripping from concrete cracks
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Wet basement or underground walls
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Continuous seepage during rain
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Damp patches along structural joints
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Expansion joint leakage
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Concrete cracks widening over time
Early treatment prevents further structural deterioration.
Our PU Injection Crack Repair Process
We follow a structured and technical repair method:
1. Crack Assessment & Diagnosis
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Identify crack type (structural or non-structural)
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Determine water pressure level
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Evaluate slab or wall condition
Proper diagnosis ensures correct material selection.
2. Injection Port Installation
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Drill controlled injection holes
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Install mechanical packers (injection ports)
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Seal surface crack externally
This allows targeted internal sealing.
3. Polyurethane Injection Application
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Inject PU resin under pressure
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Allow expansion and reaction with water
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Ensure crack is fully filled internally
The expanding foam seals voids and stops active leakage.
4. Finishing & Inspection
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Remove packers
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Seal injection points
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Final leakage inspection
Our goal is complete internal crack sealing — not surface patching.
