Concrete Water Leak
Polyurethane PU Injection

Stop leaks in balconies, retaining walls, dam and reservoir walls, tank walls, carparks, building walls and concrete floor slabs.

Request a QuoteCall us on (02) 8416 8037

What’s Concrete Water Leak Polyurethane PU Injection ?

Polyurethane Resin is used to seal and eliminate or reduce water leakage from concrete cracks and joints and can also be injected into cracks that experience some degree of movement.

FCS Concrete Repairs have the knowledge and experience to successfully carry out Polyurethane Resin Crack Injection Repairs including dry crack repairs, sealing of
water leaks, and stopping gushing water leaks and flows.

Polyurethane Resin is used to seal and eliminate or reduce water leakage from concrete cracks and joints and can also be injected into cracks that experience some degree of movement.

Benefits & Process

Hydrophilic (hydro meaning ‘water’, philic meaning ‘has an affinity for’) resins seek out water in a crack. They chase the water and absorb into the tight micro – cracks and pores of the concrete. Hydrophobic (hydro – water, phobic – fearing) resins repel water in a crack. They resist movement towards wet areas and will not absorb into tight micro cracks and pores in the concrete. All polymer repair materials get their mechanical bond in these rough areas (if the resins can penetrate them).

Since hydrophilic resins seek out water, they absorb deep into the pores and micro cracks of concrete. This gives hydrophilic resins a tenacious bond to the wet concrete. Since hydrophobic resins repel water, they will not penetrate these areas. They may be forced in using high pressure, but the water will act as a bond breaker between the polyurethane foam and the concrete resulting in extremely low bond strengths.

The basic procedure for polyurethane injection consists of first gaining control of the leaking water if leaks are high, followed by pressure injecting resin to seal the cracks.

Our process considers a tailormade solution for your
concrete repairing need. This is how we approach each project:


We conduct professional investigations and diagnosis of the issue in order to identify the source and cause. Identifying the source and cause of the issue is vital in finding the best solution and preventing further problems. Once the cause of the issue has been identified and confirmed, we then determine the optimum repair system for each specific application. These processes are often performed under the guidance of highly qualified engineers, designers or architects.


We access the most advanced technologies in concrete Restoration and Preservation from leading manufacturers worldwide to reinstate the structural integrity of any concrete structure. We strictly adhere to all manufacture and design specifications ensuring that the right system is used and applied correctly for your project.


Longevity and continuing performance of the repair can be at risk if protection and preservation measures against future potential contamination threats are not adequately addressed. We also conduct operational and environmental investigations to ensure that future contaminant risks are specifically controlled using the most effective treatments available.

Certified concrete repair and protection services

We have the most up-to-date systems and certifications to perform the best work with safety and quality.

What People Say About Us


Excellent job! I am really happy with the finished product and would highly recommend booking FCS Concrete services.

Mason Cooper

Thank you to Tony & team for a wonderful concreting job they have completed. Their communication was great from the start ensuring the desired result at the finish. I’m very happy the recommend tradespeople like this that take pride & work with professionalism & do things properly. Thanks Concrete Works

Oscar Clarke

We’ve just used Tony and his team for a major job we are having done at our block of units, Concrete Works have been brilliant to deal with, can’t recommend them highly enough, if we could give 10 starts we would!

Ethan Campbell

Would highly recommend Tony and his team if you’re looking for a trustworthy and professional service. The work completed was exceptional & completed in a timely manner!

William Anderson

This teams performance was amazing, on time, great communication. Highly recommend these boys for any of your work.

Oliver Adams