Polyurethane & epoxy injection by trained technicians — stop water at the source.
Not every crack calls for the same fix. Polyurethane injection stops water in active, wet, or moving cracks — the expanding foam seals on contact with moisture. Epoxy injection restores tensile strength in dormant cracks where the concrete needs to act as one monolithic element again.
Applying the wrong product makes things worse: rigid epoxy in a moving crack creates new fractures beside the repair line. Every Econyc job starts with a free crack assessment before any drilling begins.
Hydrophilic PU resin for active, wet, or moving cracks. Reacts on contact with water and remains flexible after cure — ideal for basement walls and slab joints.
Rigid, high-strength epoxy for dormant structural cracks in dry substrates. Cures to compressive strength exceeding parent concrete.
Every job starts with a free site assessment — crack width, moisture, movement, and structural significance evaluated before any injection begins.
Concrete is strong in compression and weak in tension. Every structure experiences tension through thermal movement, shrinkage, loading, and settlement. A hairline crack in a basement wall can transmit thousands of litres of groundwater per year. An untreated crack in a parking deck widens under traffic, admits chloride-bearing water, and initiates reinforcement corrosion — costing 10–50× more to repair at the spalled stage than at first detection.
Active or dormant? An active crack continues to move. Filling it with rigid epoxy transfers stress to adjacent concrete, creating new cracks. A dormant crack has stopped moving and can be filled rigidly. Wet or dry? Wet cracks need hydrophilic polyurethane; dry structural cracks need epoxy. Structural? Cracks in load-bearing elements need an engineer’s assessment before repair.
| Factor | Polyurethane | Epoxy |
|---|---|---|
| Primary purpose | Water sealing | Structural restoration |
| Crack condition | Wet or dry, active or dormant | Dry and dormant only |
| After-cure flexibility | Flexible / elastic | Rigid |
| Structural strength added | Negligible | Significant |
| Sydney cost guide | $150–$300 per lin. metre | $200–$500 per lin. metre |
Structural crack repairs should conform to AS 3600 and the repair material manufacturer’s specifications. Econyc provides full documentation — material data sheets, injection pressures, volumes injected, and a signed waterproofing certificate for your records and certifier.
Free site assessment · Fixed-price quote · 5-year injection warranty