Concrete Cancer

Concrete cancer occurs when the concealed steel reinforcement inside the concrete structure is affected by moisture leading to the rust and eventual corrosion of the steel. When corrosion occurs the steel expands significantly applying pressure to the surrounding concrete causing displacement. This displacement is called spalling, a visual crumbling of the exterior of the concrete.   

Building inspections often uncover or identify concrete cancer. It is more commonly identified in older homes but can still be found in newer structures where poor workmanship or insufficient attention has been given to the use of protective membranes and treatments.

Concrete cancer should be taken seriously as the structural integrity of a building can be impaired making some buildings safety risks. If spalling is evidenced or concrete cancer suspected at a building inspection and recommendations for further assessment by a specialist recommends further assessment, you should act on this advice as matter of urgency.


Concrete cancer can lay dormant without any visual signs. It can be like a time bomb. Minor cracks in concrete structures may seem harmless but within the internals of the concrete, chemical reactions could be taking place, slowly but surely reducing the strength of the concrete structure.

Concrete cancer can be treated but will require specialist assessment. If your building inspection report has recommended further assessment then you should treat this seriously, even if they only seem minor.


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