About Concrete Filler
Clear, independent information about concrete cancer for Australian property owners.
Concrete Filler exists to demystify concrete cancer — the slow, expensive deterioration that happens when steel reinforcement inside concrete begins to rust and expand. If you've spotted cracking, rust stains, bubbling render or crumbling concrete and aren't sure how serious it is, you're in the right place.
What you'll find here
We publish plain-English guides covering the full picture: what concrete cancer actually is, why it happens, how to recognise the early warning signs, the repair methods professionals use, what those repairs typically cost, whether insurance might help, and how to stop the problem coming back.
Who writes this
Our guides are researched and edited by Sophia Harris and the Concrete Filler editorial team, drawing on established concrete-repair practice and Australian building experience.
An important note
This site is educational. Concrete cancer affects the structural integrity of buildings, so significant or worsening damage should always be assessed in person by a qualified structural engineer or concrete-repair specialist. Use our guides to understand your situation and ask better questions — not as a substitute for a professional inspection.