May 01, 2019

Using Liquid Spray-On Membranes to Permanently Fix Roof Leaks

Case Study: Severely Leaking Concrete Roof Slab.

  • Brought back to life with a single spray application of Liquid Applied Waterproofing System. 

Melbourne- waterproof membrane for roof leaks

Infographic  - Findlay-Evans Waterproofing Solution for Roof Leaks 


Waterproofing Membrane to Repair Leaking Flat Concrete Roof Slab-Melbourne CBD-infographic_optimized (2)

VIDEO - How to a Fix Leaking Concrete Roof


  • Best waterproofing method are Liquid Applied Systems. 

  • Liquid Applied Waterproofing Membranes are the new generation state-of-the-art product providing permanent waterproof coatings for leaking roofs.

View Case Study Video Below 

Video Transcript - Concrete Roof Case Study

Hello this is Paul Evans, Findlay-Evans Waterproofing.

This is a waterproofing case study how to fix leaking concrete roof.

This concrete roof is a commercial building Allied Mills in Melbourne CBD

The membrane system applied to the flat concrete roof slab  was causing water ingress to the areas belwo the roof.

Due to the fact this was a commercial premises producing flour, the roof water leaks had to be solved permanently.

The concrete roof basically was in structurally good order.

However, the waterproof membrane was badly deteriorated and leaking.

The Findlay-Evans Team removed the defective waterproof membrane system by a lot of manual labor by scraping it off in this situation.

Access was  limited on this job, and quite high up, as the images can show.

Our Team used mechanical scrapers to actually remove all the old polyurethane membrane which had deteriorated rapidly.

Once all the polyurethane membrane was removed off the concrete roof, we then went about cleaning the concrete roof again.

This is to ensure that we had a good bonding surface for the new liquid rubber membrane.

Some areas of the leaking roof  needed some repaired  screed, - so we screed them up with a special designed flexible screed, and that then was overcoated with a liquid rubber membrane.

To protect this concrete roof, it's important to make sure that a liquid rubber waterproofing membrane was used -  as it is a highly flexible membrane.

This extreme flexibility allows the membrane to move withe the building due to normal expansion and contraction.

This building actually being so tall, moves quite frequently, unbeknownst to the naked eye, but it does move around a fair bit. So, just wind applying on the building causes vibration and movement.

This movement is then taken up by using a liquid roof membrane. 

Once one spray-applied layer of Liquid Rubber was installed , we put an interlayer of fiberglass mesh into it again, to toughen it up.

Then overcoated the whole roof system with a thermal top coat.

Thermal Top Coat allows temperature reduction to areas beneath the concrete roof quite considerably.

This helps with internal ventilation basically in keeping the place cool inside during summer months.

The system was fully overcoated with our thermal top coat to produce a nice gray finish, which is pleasing on the eye, as well as thermally reflective.

This extensive remedial waterproofing project was completed on time and on budget.


So, if you got any questions:

PHONE: 03 8812 2198

Email: info@waterproofingfew.com.au

W: www.waterproofingfew.com.au

Case Study Audio File

Roof Coating for Leaking Rooftop Deck

Listen to Audio File Below:

Roof Waterproof Coating - Liquid Membranes


  • Liquid Rubber can be applied vertically and horizontally - around all roof penetrations and rooftop deck utilities. 
  • Spray applied waterproofing can be applied directly on the existing roof surface. 
  • This will restore a leaking and deteriorated roof back to life without removing the old membrane - saving costs and time.
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Case Study Videos 

Findlay-Evans Waterproofing Projects: solving roof leaks in Melbourne.