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Concrete Repair Works – How we do it and our recommendations

Concrete Repair Works – How we do it and our recommendations:

Concrete Cancer can slowly kill a building if not stopped.

If left untreated, it is not only unsightly, but pieces of concrete may come lose and fall off the building posing a risk of injury to people walking by and damage to other property.


Concrete cancer is rust originating deep within the concrete- specifically within reinforcing steel. As steel rusts, it can expand up to 7 times its original size causing the surrounding concrete to be displaced.


The problem is very likely to be much more extensive than what is apparent on the concrete surface. The cancer will have spread along the reinforcing in each direction. It is impossible to know the extent until the concrete is chiselled away.

Concrete cancer exposing reinforced steel


Visual signs:


  • Flaking, spalling concrete
  • Rust Stains leaking out of the concrete
  • Bubbling, blistering, plating of concrete render
  • Leaks in overhead concrete surfaces
  • Rusting and exposed reinforcement pushing concrete to become lose


The typical method of concrete cancer repair follows a process of:

  1. Break out unsound concrete and expose reinforcing steel until sound concrete is found and clean non-corroded steel reinforcing.
  2. Saw cut repair zone perimeter to eliminate feather edges.
  3. The concrete around the reinforcing steel is chiselled away. Prepare substrates including removing any corrosion. Reinstate steel and/or add more as deemed necessary.
  4. After completion of material removal, concrete primers and rust inhibitor to the steel are applied prior to reinstating with a high build shrinkage compensated repair mortar. Form work may be erected to close the cavity prior to installing the repair products.
  5. For further long-term protection we also recommend a membrane coating system. Install a heavy duty modified acrylic membrane in multiple layers as a moisture barrier primer system. The primer system will assist in preventing bubbling or blistering, which is highly likely if the remedial waterproofing application is not performed, which could otherwise affect the durability of the system. Our recommendation is that treatment of concrete cancer should incorporate proper weather / waterproofing membrane or it risks being a temporary solution.

The membrane system is detailed to all penetrations and junctions. The system will be supported by manufacturer warranty for 10 years and extendable for a further 10 years with a maintenance application.


Cracks can also be repaired using a technique called crack injection where suitable epoxy or polyurethane resins are injected.

Concrete repair in progress


Concrete repair step 1 - Waterstop Solutions   Concrete repair step 2 - Waterstop Solutions   Concrete repair step 3 - Waterstop Solutions

Concrete repair in progress - Waterstop Solutions

If you have cracked or damaged concrete and would like our experienced inspector carry out an inspection and provide you with recommendation and a quotation to carry out concrete repairs, you are welcome to contact our office to arrange a site visit on (07) 3205 1899 or send us an online request here:

Follow this link to Book inspection with our senior waterproofer and concrete expert 

We welcome your questions as we are happy to help.

Ph: (07) 3205 1899
Email: [email protected]


Click here to view our Capability Statement and Technical Systems Information Sheet to find out what other services we can provide you with.


Waterstop Solutions is committed to providing a high standard of service. With more than 50 years combined industry experience in our management team, we lead our work force to deliver just that. The best measure of our success is the “follow on” works from our existing clients. 

Our commitment to safety and our impact on the environment always takes first priority. Our approach to quality is to plan; control; monitor and grow from the outcomes. Quality assurance is a tool for us; the client and the supplier to micro manage the critical elements of their project that ultimately produces an optimal result. With limited training opportunities for our field of expertise in Australia, we have invested in sending our project manager to Singapore, USA and Germany (recognized leaders in this field) to undergo extensive training. This provides us with the foundation for further development and up-skilling of our Australian workers.
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