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Flooded Sydney car park emergency response

Sydney flooded car park -leak sealed by Waterstop Solutions

Flooded Sydney car park emergency response


Sydney basement car park suffering high-flow water intrusion


Waterstop Solutions NSW came to the site manager’s aid by swiftly responding to the emergency situation where the whole lower level of the car park was flooded. We were contracted to slow the water ingress enough to allow the client to appoint another contractor to build a new retention pit.

A mixture of water and sand was rushing in through the blown-out base of a retention pit that was built 1.9 metres below the water table. Stemming the water was a matter of urgency as the water was rising fast in the lower level of this car park, putting cars at risk as the water was moving up higher and higher.

Once our leak sealing technicians had slowed the high-flow water intrusion down, we had vacuum trucks ready to remove the sand and used a large pump to pump the water into an existing stormwater line while our technicians could install concrete into the existing pit.

This procedure was followed by treating the area by targeted high-pressure injection creating a curtain wall around the pit by using a hydrophilic polymer resin. Once completed, the project was ready to be handed over to the sub-contractor to build the new retention pit.




When we carry out leak sealing injection work, we use the highest quality injection product available offering, superior performance benefits including:

  • Hydrophilic reaction (the product is actively chasing moisture, filling and sealing the crack by rapid reaction with the water present in the crack).
  • It rapidly forms a highly resilient and permanent flexible seal that allows movement to the crack, fracture or joint.
  • It has excellent tensile adhesion to most surfaces including concrete, brick and mortar.
  • Very low shrinkage.
  • Low viscosity.
  • It is resistant to most organic solvents, mild acids and alkalis.
  • It reacts with seawater or mineral water.
  • Water potable, compliant to AS4020 (Australian Standard for potable water).
  • It is solvent-free, environmentally safe



Polyurethane Concrete Crack Injections step by step.

Image: Example of leak sealing injection with polyurethane resin into a concrete wall.

The leak sealing process, or polyurethane (PU) injection, involves the high-pressure injection of flexible water-reactive polyurethane (resin) into targeted areas to form a durable seal. This system is ideal where a long-lasting waterproof seal is required to stop the passage of water or other liquids through gaps, cracks, joints, and penetrations – typically in concrete and masonry construction.

It is a highly specialised process, requiring the skills of experienced operators. At Waterstop Solutions, our leak sealing specialists perform polyurethane injection works frequently. They receive ongoing training from industry leaders which equips our technicians with expert skills and knowledge.

We use the best Polyurethane (PU) product available as our primary injection resin. This resin offers superior performance. Its main features include permanent flexibility; very low shrinkage; water potable; low viscosity; and a hydrophilic reaction – it is the same product that is pre-approved by major traffic authorities around the world for major infrastructure assets. Our proprietary leak sealing system forms a long-lasting flexible seal against water ingress which also withstands normal building movement between construction elements and details.

This system can be installed in any weather – in fact,  the wetter the better, as it reacts with water right before your eyes. In dry weather, flooding the source of water entry (where possible) may have a similar effect.

Waterstop Solutions’ proprietary injection system exceeds the highest injection process and safety standards in Australia and internationally throughout Europe and the USA.



Give us a call to discuss the best protective treatment application for your vertical and horizontal surfaces to help you choose the appropriate product and methods to protect them and how to best prepare the surface before installation for best performance.

If you have any issues with water ingress, rooftop leaks, leaking balcony, leaking basement, cracking concrete slabs, structural cracks, concrete deterioration, spalling concrete, concrete cancer, deteriorated joints, moisture, seepage, efflorescence, rising damp and/or high-flow active leaks in concrete structures, we would be happy to assist you. You are welcome to contact us with any questions that you may have.


Brisbane office: (07) 3205 1899   


Sydney office: (02) 9346 8308   

Email: [email protected]


Are you interested in finding out more about the various remedial building services we are providing?

Please click on the image below to download Waterstop Solutions Capability Statement

Waterstop Solutions Capability Statement

Waterstop Solutions Capability Statement is now available to download as PDF. (The image is clickable and opens up a link to our Capability Statement). 




Good maintenance begins with a proactive approach to maintain, keep, preserve and protect a building. 

Remember that seepage/water ingress into areas such as balconies, basements, concrete roofs, car parks and retaining walls, should not be ignored – call a remedial waterproofing professional today for an assessment to provide you with the best solution for your situation.

At Waterstop Solutions, we carry out a wide range of remedial works to concrete structures post-construction stage in Brisbane, Gold Coast, Sunshine Coast, Sydney and outlying areas in Queensland and New South Wales.

Equipped with major civil works experience, we can quickly determine the best approach to rectify all seepage and concrete deterioration issues.


It takes licenced remedial waterproofer and leak sealing experts like us at Waterstop Solutions to ensure that the pathways for water to ingress are properly sealed off. A depth of technical knowledge and experience, along with a proud reputation for integrity and reliability, has made Waterstop Solutions the go-to company for many Defect Managers working for major construction companies across Queensland and New South Wales.

We at Waterstop Solutions have the technical and practical expertise to diagnose the source of the leak and will provide you with our recommended solution to achieving an effective, high-quality, long-lasting repair to stop the water ingress with minimal disruption

We believe in and are committed to always delivering high-quality solutions by utilising the right products and techniques for each specific project combined with our industry-leading know-how on tap. We have a large talent pool of specialist leak sealing and concrete repair technicians with Certificate III in construction waterproofing in Queensland and New South Wales that are extensively trained in our systems and project execution methods.

The leadership positions on every Waterstop Solutions project are operated by highly qualified, certified and experienced industry professionals. Our in-house skills and expertise gained from more than 60 years of industry experience provide a full range of high-quality remedial waterproofing and concrete repair works to commercial buildings, civil infrastructures, industrial sites and residential properties. From waterproofing diagnostics, preventative and remediation solutions – All of our waterproofing solutions are quality guaranteed.


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