The Waterproofing Experts
1800 326 723Commercial roof overlay upgrade in Black Rock, Melbourne
Danrae Group were engaged to resolve ongoing roof leaks at a commercial site in Black Rock, Melbourne. The existing metal roof was ageing and allowing water ingress, creating ongoing maintenance risk for the owner.
A full roof replacement was considered, however the building’s rooftop telco infrastructure and the high cost of removal made replacement a significantly more disruptive and expensive option. Danrae Group recommended a PVC sheet roof overlay to deliver long-term waterproofing performance while keeping the site operational.
Key challenges & issues encountered
This project required a solution that balanced performance, safety, access constraints and minimal disruption. Key issues included:
1) Persistent leaks
The roof was experiencing recurring water ingress, requiring a long-term solution rather than continued patch repairs.
2) Rooftop telco equipment
Active telecommunications infrastructure was installed on the roof, creating constraints around:
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safe access and staging of works
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maintaining service continuity
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detailing around penetrations and equipment zones
3) Replacement as cost-prohibitive
Removing and replacing the existing roof would have significantly increased cost due to:
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demolition and disposal requirements
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disruption and safety management
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complexity around rooftop services
4) Penetrations & detailing risk areas
As with many commercial roofs, penetrations and junction points increased risk of water tracking if not detailed correctly. Achieving a watertight finish required careful preparation and compliant detailing.
The solution
Danrae Group delivered a PVC roof overlay system installed directly over the existing metal roof, eliminating the need for full roof removal.
Works included:
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roof assessment and suitability confirmation
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targeted preparation and treatment of vulnerable areas
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installation of a PVC sheet overlay system to form a continuous waterproofing layer
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compliant detailing to edges, penetrations, and terminations
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coordination of works around telco infrastructure to ensure uninterrupted service
The outcome
The PVC roof overlay delivered a durable, compliant solution that resolved the ongoing leaks without disrupting site operations. Throughout the works, telco services were maintained, and the project achieved significant cost savings compared to a full roof replacement. The completed system extended the roof’s lifespan and improved long-term performance, giving the client greater confidence in ongoing protection and reduced maintenance risk.
If you’re managing a commercial building with recurring leaks, corrosion, or an ageing metal roof, Danrae Group can assess whether an overlay is suitable.
Contact us today or learn more about our metal roof overlays
