Concrete Cancer Repair in Brisbane

A concrete cancer repair deals with two things at once: steel rusting inside the concrete, and the water that keeps reaching it. In Queensland, building work valued over A$3,300 needs a QBCC-licensed contractor, and any engineering assessment or design for the repair must be done by, or under the direct supervision of, a practising registered professional engineer.

Call (07) 3523 1792

What concrete cancer repair in Brisbane actually involves

Water reaching the reinforcing steel, through cracks or through the pores of the concrete, starts it rusting. The rust occupies more room than the steel it formed from, so it forces the surrounding concrete to crack further, which lets in still more water. Eventually a piece of the concrete cover breaks away: that is spalling.

Who has to sign off the design

A professional engineering service in Queensland, applying engineering principles to a design or to a maintenance activity, must be carried out by a practising registered professional engineer, or under the direct supervision of one who is responsible for it.

The front edge of a concrete balcony slab with a diagonal crack across its painted face and a small area of concrete missing at the corner, under a metal balustrade — concrete cancer repair, Brisbane. Illustrative example.

The water is the part that keeps it going

Because the rust keeps forcing the cracks open, a repair that leaves the water's entry point untouched leaves the cause of the damage in place. Ask a provider where the water is getting in, and what the quote actually does about it, not only about the visible damage. The balcony page covers who is responsible for a slab, the spalling page covers reaching the damage and the Council's permits, and the inspection page covers the signs.

Not every repair needs Council building approval, and not every repair is exempt. Queensland's Building Regulation 2021 exempts a repair from approval only where it does not change the building's floor area or height and does not affect a structural component other than a minor one, and even then the home owner stays responsible for the work meeting the standards. Where it is unclear, the Council's own advice is to contact a licensed building certifier. The suburbs page lists the localities this site covers.

A rectangular recess cut into the edge of a concrete slab down to one rusted reinforcing bar, with grey dust sheeting laid on the floor below — concrete cancer repair, Brisbane. Illustrative example.

Concrete cancer repair costs and rules check