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.
PU injection is commonly used when there is:
Active water leakage from wall cracks
Basement seepage under hydrostatic pressure
Concrete slab water infiltration
Lift pit leakage
Retaining wall seepage
Underground structure cracks
It is especially effective for structural cracks that leak during heavy rain, which is common in Terengganu’s climate.
If you notice any of the following, professional inspection is recommended:
Water dripping from concrete cracks
Wet basement or underground walls
Continuous seepage during rain
Damp patches along structural joints
Expansion joint leakage
Concrete cracks widening over time
Early treatment prevents further structural deterioration.
We follow a structured and technical repair method:
Identify crack type (structural or non-structural)
Determine water pressure level
Evaluate slab or wall condition
Proper diagnosis ensures correct material selection.
Drill controlled injection holes
Install mechanical packers (injection ports)
Seal surface crack externally
This allows targeted internal sealing.
Inject PU resin under pressure
Allow expansion and reaction with water
Ensure crack is fully filled internally
The expanding foam seals voids and stops active leakage.
Remove packers
Seal injection points
Final leakage inspection
Our goal is complete internal crack sealing — not surface patching.
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