Concrete cancer is one of the most common and costly building defects seen in Gold Coast properties — particularly older apartment buildings and strata complexes exposed to the region’s salty coastal environment. Here’s what it is, how to spot it, and what to do about it.
What Is Concrete Cancer?
Concrete cancer — technically known as concrete spalling or reinforcement corrosion — occurs when the steel reinforcement bars embedded inside concrete structures begin to corrode. As the steel rusts, it expands, creating internal pressure that causes the surrounding concrete to crack and break away.
Left untreated, concrete cancer will continue to spread. What starts as surface staining or minor cracking can develop into significant structural damage that is far more costly to repair.
What Causes Concrete Cancer?
The Gold Coast’s coastal environment is one of the primary drivers of concrete cancer in our region. Salt air and moisture penetrate concrete over time, reaching the steel reinforcement and triggering the corrosion process. Other contributing factors include:
- Poor concrete cover over reinforcement during original construction
- Cracked or deteriorating waterproofing allowing water ingress
- Carbonation of concrete over time, reducing its protective alkalinity
- Physical damage to concrete surfaces exposing the reinforcement
Signs Your Building May Have Concrete Cancer
- Rust coloured staining on concrete surfaces — often the first visible sign
- Cracking or spalling — chunks breaking away from concrete surfaces
- Bubbling or uneven areas on balconies, facades or structural members
- Visible pieces of concrete falling from balconies or overhangs
If you notice any of these signs on your Gold Coast property, it’s important to have a licensed builder carry out an inspection as soon as possible.
How Is Concrete Cancer Repaired?
The repair process depends on the extent of the damage but typically involves:
- Full assessment of the affected area to determine the extent of corrosion
- Removal of all damaged concrete to expose the corroded reinforcement
- Treatment of the reinforcement steel to halt further corrosion
- Application of specialist repair mortars and coatings
- Reinstatement of surface finishes and protective coatings
- Waterproofing to prevent recurrence
Why Act Early?
Early intervention is always cheaper than waiting. A small area of concrete cancer treated promptly can cost a fraction of what a large-scale structural repair will cost if left to spread. In body corporate buildings, early action also protects the building’s structural integrity and avoids the need for costly emergency works.
At Oasis Developments, we have extensive experience in concrete cancer assessment and repair across Gold Coast residential and strata properties. We carry out thorough inspections, provide clear and honest quotes, and complete repairs to a high standard using quality materials.
Contact Ben on 0405 355 247 or [email protected] for a no-obligation assessment