Homeowner symptom guide · Melbourne
Peeling Exterior Paint: Causes & the Right Way to Fix It
Peeling exterior paint on a Melbourne home is both a cosmetic and a structural concern. The paint film is your home's primary defence against moisture penetration and timber rot — when it fails, the substrate is exposed to Melbourne's alternating wet winters and hot summers. Understanding why it's peeling determines the correct fix.
Take the free home risk check →Common Causes
- • Moisture behind the paint film: the most common cause. Moisture entering through failed caulking, poor drainage, or rising damp forces its way behind the paint film and breaks the bond. The paint lifts and eventually peels.
- • Poor surface preparation before previous painting: paint applied over a dirty, wet, or inadequately primed surface bonds poorly and peels relatively quickly — often within 2–5 years of the last paint job.
- • Incompatible paint systems: applying water-based paint directly over oil-based paint without correct preparation causes bonding failure and peeling — a common issue in homes that have had multiple paint jobs over decades.
- • Natural UV degradation: even well-applied paint eventually breaks down under Melbourne's UV exposure, chalking and losing adhesion — particularly on north and west-facing surfaces with maximum sun exposure.
When to Be Concerned
- Paint is peeling from the substrate (timber visible underneath) — timber is now exposed to moisture
- Peeling is accompanied by soft or spongy timber when you press on it — timber rot has begun
- Peeling is spreading rapidly across large areas in a single season
- Render is delaminating in sections along with the paint
What to Do
- 1 Identify and fix the moisture source before repainting — painting over a moisture problem guarantees rapid re-failure.
- 2 Strip all peeling and failed paint back to a sound surface — do not paint over loose paint.
- 3 For timber substrates, inspect carefully for rot — soft or hollow sections need replacement before painting.
- 4 Engage a professional painter who performs proper surface preparation: scraping, sanding, spot priming, caulking all joints, and a full primer coat before the finish coats.
Frequently Asked Questions
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Can I paint over peeling paint to fix it?
No — painting over peeling or failed paint creates a weak bond that will fail again quickly, often within months. All loose paint must be removed, the surface repaired and primed, and only then painted. Short-cutting preparation is the leading cause of premature paint failure.
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How much does exterior repainting cost in Melbourne?
A full exterior repaint of a typical Melbourne home (brick veneer or weatherboard) costs $5,000–$18,000 depending on size, complexity, and extent of surface preparation required. Homes requiring significant rot repair or render patching cost more.
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