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Commercial Rooftop Membrane Refurbishment in Sydney

Bituminous torch-on membrane installed on roof top - by Waterstop Solutions NSW

Commercial Rooftop Membrane Refurbishment in Sydney

Remove and reinstate bituminous torch-on membrane

Waterstop Solutions NSW was engaged to inspect a leaking concrete rooftop of a commercial building in Sydney and to provide an asset preserving remedial waterproofing solution. During the inspection, Adrian, our NSW manager found several areas where the existing torch on roof membrane had failed.

Adrian’s recommendation was to remove the existing membrane, carry out surface preparation, apply a moisture barrier primer system and install a heavy-duty modified two-layer bituminous torch-on membrane to the roof to form a fully bonded, continuous barrier to water penetration. The mineral chip finish on the top layer provides a first-rate UV light protection. Waterstop Solutions NSW leak sealing specialist team also removed sections of brickwork to terminate the membrane as per manufacturer’s specification. The membrane system was detailed to all penetrations and junctions. Once the membrane was applied, a flashing was installed over the entire parapet.

The system will be supported by the manufacturer’s warranty for 20 years.




  • Insufficient substrate preparation.
  • Incorrect product specification – A waterproof system that not fit for the purpose and/or the environment the rooftop is exposed to.
  • Failure to prime the respective parts and surfaces before the application of the membrane.
  • Seam failure and other installation errors such as adhesion failure between the primer and the membrane.
  • It is possible for water to get trapped between the two layers of roofing during application or repair. Therefore, it is important that torch on roofing systems are installed in dry conditions.


Minimising water damage from water ingress is key to protecting the building’s lifespan and preserving its value. Inspecting rooftops on a regular basis is critical because if you do discover any early-onset defects in the waterproof membrane or any other entry points for water, you can remedy the defects before they become a bigger problem. A seemingly small issue may grow into a big problem if left untreated or incorrectly repaired.

Cracks and voids can form in concrete due to thermal expansion, contraction, concrete shrinkage and building movement, so water will likely seep through these voids if there are any breaches in the waterproof membrane.

Roofs are constantly exposed to direct sunlight and rain, making them vulnerable to tremendous environmental stresses that can affect their physical properties and performance. Selecting the correct waterproofing system is imperative to keeping the roof water-tight so to ensure the structural integrity and to protect the homes and assets of the residents.

Proper design of falls is an essential consideration in the overall drainage of a flat roof. Falls create flow paths to direct the rainwater away from the roof to suitable discharge points. To be effective, it is essential to clear surface water as rapidly as possible from the flat roof to avoid ponding or stagnation of water on the roof itself.


The key to successful remedial waterproofing is thorough surface preparation and vigilant detailing of all penetrations and junctions, married up with high-quality materials.



If you have any issues with water ingress, rooftop leaks, leaking balcony, 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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