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Specialist leak sealing repair of defective rooftop membrane

New roof membrane installed, joints sealed and fall to drain corrected - Waterstop Solutions

Specialist leak sealing repair of defective rooftop membrane


Providing tailored quality repairs to leaking rooftop membranes


When our client inspected their building’s roof, they identified that the concrete roof required a new waterproof membrane as well as the joint sealant refurbishment along the perimeter.

They noticed that the waterproof membrane showed signs of deterioration and that rainwater had leaked into the warehouse through the deteriorated joint sealant. Additionally, during Waterstop Solutions’ site inspection, our inspector identified there were some areas of pooling water due to inadequate falls to the drainage, which needed to be rectified.

Correct design specification of gradient falls to drains/floor waste is critical to ensure effective drainage on flat rooftops. Adequate falls create flow paths that direct the rainwater efficiently to suitable discharge points as rapidly as possible to help avoid ponding water.


Ponding water on flat roofs is one of the main causes of waterproof membrane deterioration because most membranes such as acrylic membranes are not designed to withstand pooling water. Standing water turns it into a muddy consistency when mixed with dust, plant matter and pollution and when the water has dried out, the crust contracts and puts the membrane under stress. Over time, this often causes the membrane to crack and peel – allowing water to leak through to the substrate.

As you can imagine, rooftop waterproof membranes are under continuous environmental stress; They are exposed to strong UV rays, rain, pollution, and salt if near the ocean, which can decrease the waterproofing membrane’s performance over time. The performance reduction can make the concrete and other building elements vulnerable to water ingress.

To achieve reliable and long-lasting solutions for our clients, we select high-quality and fit-for-purpose waterproof membranes combined with thorough surface preparation, correct installation and detailing.


On this roof we recommended the following cost-effective remedial waterproofing works to replace the existing waterproofing membrane and improve the fall to the drain/floor waste:

  1. Pressure clean existing waterproofing membrane
  2. Remove bottom of sheeting to allow detailing of waterproofing membrane to floor/wall joints
  3. Improve the gradient fall around the drain
  4. Install 2 coats of heavy-duty modified acrylic waterproofing membrane over 2 coats of moisture barrier primer system
  5. Install premium joint sealant to the perimeter of the rooftop
  6. Re-instate bottom wall sheeting


We pressure-cleaned the existing waterproofing membrane to remove the build-up of dirt and grime and removed the bottom of the sheeting covering the edges to allow access to the floor/wall joints. Our leak sealing specialist improved the gradient fall to the drain/floor waste to help ensure an effective discharge of rainwater from the roof surface.

After the removal of the existing joint sealant, he installed a heavy-duty modified acrylic waterproofing membrane to a moisture barrier primer system detailed to the floor/wall joints. A new premium joint sealant was installed to the floor/wall joints along the perimeter of the rooftop area.

2 coats of heavy-duty modified UV-stable acrylic waterproofing membrane system were installed over 2 coats of moisture barrier primer system and detailed to all penetrations and junctions followed by re-instating the bottom part of the wall sheeting. The waterproofing system will be supported by the manufacturer’s warranty for 15 years and extendable for a further 10 years with a maintenance application.



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, wet lift pit, 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.

Waterstop Solutions teams are available for all your concrete repair and remedial waterproofing needs in Brisbane, Gold Coast, Sunshine Coast and Sydney.


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 licensed 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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