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Remedial Waterproofing

Maintaining the "envelope"

Remedial waterproofing aims to stop water ingress once it already has to an existing building.

So, imagine that a building's external skin is an envelope, working to protect the internal spaces and its structural components from weathering and deterioration. 

On the whole, this envelope works - but it is a common principle that 90% of water ingress issues are from just 1% of the total building or structure exterior surface area caused by anything other than material failure in most cases.

it only takes a minor crack, hole or breach for moisture in all its forms (liquid, vapour, solid)  to infiltrate the envelope (sometime with help from wind, mortar shrinkage, movement, freeze / thaw cycles, etc) 

As a specialist in this field, we follow the following sequence when inspecting projects;


  • Inspection of damage and leakage
  • Determine the cause of the leak
  • Choose the most appropriate system for repair
  • Clean and prepare any substrate 
  • Carry out restoration / repair work to the substrate 
  • Application of waterproof system. 

We can assist you with leaking balconies, above ground areas, below ground areas along with any substrate repairs. 

the waterproof "envelope" has been breached

the waterproof "envelope" has been breached

Why balconies leak

this is a well presented, simply explained video of why your balcony may be leaking. 

the waterproof envelope - putting it all together

We also offer a range of services that will help to maintain the waterproof envelope to areas such as 

  • Balconies 
  • Basements 
  • minor building repairs
  • Floors 
  • Carparks
  • Landscaping 
  • Plantrooms
  • Pools and Ponds
  • Roofs
  • Warehouses 
  • Watertanks 

Concrete Repairs

Repairing or preparing the substrate (usually concrete) is critical in the waterproof envelope process, such as. 

  • Crack Repairs 
  • Creating / Altering falls  to stop ponding
  • Drainage head alterations / repairs 
  • etc

Coatings and Sealers

  • Concrete and Paver Sealers
  • Specialist coatings such as Epoxy and Polyurethanes 
  • Weather protection coatings
  • Floor Coatings 
  • Decorative paints


We work with reputable suppliers such as Concrete Protection to ensure we are using quality products. 

its also prudent to ensure an inspection and maintenance program be set up to help prevent further issues. 

We can help with this. 


We are insured for:

  • Public Liability Insurance up to $20 million AUD
  • Workcover Insurance
  • CM 3 pre-qualification
  • Member of the Australian Institute of Waterproofing

Contact us

Contact us for a discussion on how we can help you. 

You can also search facebook (@fortresswaterproof) for our dedicated page. 

Contact us