Concrete Cancer Repair on the Sunshine Coast

Concrete cancer is rusting steel inside the concrete, and the repair is licensed work: in Queensland, building work valued over A$3,300 needs a QBCC licence. QBCC's licence pages name no class for concrete repair, so the useful question for any quote is which licence the work is done under.

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What concrete cancer repair on the Sunshine Coast actually involves

Cracks or pores in concrete let water seep in, and that water reacts with the steel reinforcing to produce rust. The corrosion product takes up more space than the metal it formed from, and the part of the concrete that carries the load is the part being eaten away, which is why the damage is serious. The rust then pushes outwards. UNSW's newsroom describes the final stage as the concrete breaking apart, a process called spalling that is more widely known as “concrete cancer”.

A concrete slab underside with a hairline crack and a rust stain along it — concrete cancer repair, Sunshine Coast. Illustrative example.

Why it keeps growing

As rust forms it opens bigger cracks, and each crack lets in more water, so the concrete degrades further over time. In Queensland, individuals and companies must hold a QBCC licence to carry out building work that is: valued over $3,300. QBCC says to ask to see the contractor's licence before you sign a contract or hand over money.

Ask what the quote assumes about how much of the steel has corroded, and who will examine the structure where the damage is more than cosmetic.

A duotone view of a concrete section where a rusting bar swells and cracks the cover concrete — concrete cancer repair, Sunshine Coast. Illustrative example.

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