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Construction joint repair – Sydney multilevel car park

Joint repair - joint refurbishment - joint sealing - Sydney car park construction joint - Waterstop Solutions

Construction joint repair – Sydney multilevel car park


Entry ramp construction joint repair in Sydney multilevel car park


Our Waterstop Solutions NSW team in Sydney has recently been carrying out a fair few joint refurbishment and joint sealing works.

One example is an entry ramp to a multilevel car park where the joint sealant was pulling away from the edges of the construction joint.

Not only did the damaged joint affect the aesthetics of the car park as well as creating a potential trip hazard, but it also allowed water to seep through to the car park level below.

Eventually, if this damaged joint had been left untreated, further water damage would likely accelerate the degradation of the rubber grommets in the construction joint and in turn cause damage to the concrete structure.

Another possible consequence of continued dripping of calcified water is that tenants might end up finding themselves in a position where they cannot use their parking spots without risking damaging stains being deposited on their cars or having other personal belongings damaged by water.


Causes of joint problems in concrete slabs

Joints are subject to many factors which influence their design and service life. In load-bearing conditions such as at the entry/exit ramp of a car park in a commercial or a multilevel apartment building, the service life can be compromised. Joint deterioration, cracks, concrete spalling and water ingress/seepage affect the longevity of the asset.

The placement and the sealing of concrete joints are both very important aspects of construction to ensure that the concrete slabs remain intact and structurally sound.

Improper filling and/or sealing of joints by using incorrect material, inadequate filler depth and incorrect ratio of sealant, are just some of many causes of joint problems in concrete structures.


In this case, there are three (3) main reasons for the joint deterioration:

    1. Product failure – The ideal product should be rigid enough to support traffic, have good abrasion resistance, resilience to absorb impact and support the edges of the joint and soft enough to expand and contract as the joint moves due to shrinkage and/or thermal changes.
    2. The concrete on either side of the joint wasn’t prepared properly and had pulled away.
    3. The ratio of sealant was incorrect – It needs to be twice the width to the depth.


This is how Waterstop Solutions refurbished the entry ramp construction joint

  • Removed the existing joint mechanically.
  • Prepared the surface by grinding and removing all the residue.
  • Removed all dust with a vacuum.
  • Installed backing rod, closed cell to the correct depth to create the proper ration 2:1 Depth to Width.
  • Taped and primed the joint.
  • Filled joint with a durable, high-performance, flexible, UV-stable, non-sag polyurethane sealant that forms a strong adhesion to the substrate and offers an excellent performance in moving joints.
  • Scraped excess sealant and removed the tape.
  • Quality checked the finished joint refurbishment with a further quality check within the next 12 months.



Image:  Joint sealant is pulling away from the edges of the construction joint.


Image: Removal of old sealant. 


Image: During joint repair.

If you have any issues with water ingress, cracking concrete slabs, structural cracks, concrete deterioration, 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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