Curtain Injection.
Curtain injection is a specialised remedial waterproofing technique used where water is entering a structure from the external side, but direct access to the outside face is not possible.
The process involves drilling a pattern of injection holes through the wall or slab and injecting low-viscosity resins, typically polyurethane or acrylate gels. These materials travel through cracks, joints, and voids, then spread into the surrounding soil or behind the structure. Once cured, they form a continuous, flexible waterproof “curtain” that blocks groundwater and lateral moisture pressure before it reaches the structure.
Curtain injection is commonly used in basements, retaining walls, tunnels, lift pits, and underground structures where excavation would be disruptive or impractical. It is effective against active leaks, hydrostatic pressure, and construction joint failures, providing a long-term, non-invasive waterproofing solution.
When properly designed and executed, curtain injection restores watertight integrity without structural demolition, making it a reliable solution for failed or under-designed waterproofing systems.
How it works
1
Inspection & Leak Mapping
Water entry points are identified through detailed inspection and testing to locate cracks, construction joints, cold joints, and porous areas. Tracing moisture pathways allows the repair to target the true source of ingress, ensuring the injection system is correctly positioned for effective and long-term waterproofing performance.
2
Drilling Injection Pattern
A designed grid of holes is drilled through the wall or slab to access the area behind the structure. The spacing and depth are engineered to ensure injected materials can effectively spread, penetrate voids, and form a continuous waterproof barrier.
3
Installation of Packers
Injection ports are installed into the drilled holes to allow controlled delivery of the resin. These ports regulate injection pressure and flow, ensuring the material is evenly distributed behind the structure without causing damage or uncontrolled leakage.
4
Resin Injection
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5
Curing & Sealing
The injected resin reacts and cures in place, expanding and bonding within the substrate to form a continuous waterproof curtain that blocks groundwater, resists hydrostatic pressure, and prevents further water ingress.
6
Finishing & Testing
After curing, the injection packers are removed, any disturbed surfaces are repaired or finished, and the area is inspected to confirm that all leaks have been effectively sealed, ensuring a durable and watertight result.
