12 Mould Prevention Tips to Get Through Melbourne’s Winter
Every year it is the same story. April arrives, the temperatures drop, and within weeks Melbourne homeowners start seeing the telltale signs: foggy windows every morning, musty smells in the hallway, and those first dark spots appearing in the bathroom ceiling corners. Melbourne’s winter is mould season, and if you do not take preventive action before it sets in, you will spend the next four months battling growth that seems to appear faster than you can clean it.
The good news is that most winter mould is preventable. These 12 practical tips are specifically tailored for Melbourne’s climate and housing stock — not generic advice that ignores the realities of our cold, damp winters.
1. Ventilate Every Day, Even When It Is Cold
Open windows for at least 15 minutes daily to exchange moist indoor air for drier outdoor air. Yes, even in winter. Melbourne’s outdoor air in winter is typically less humid than the air inside a heated, occupied home. Focus on opposite windows for cross-ventilation.
2. Run Exhaust Fans Properly
Turn on bathroom and kitchen exhaust fans before you start producing steam, not after. Leave them running for at least 20 minutes after you finish showering or cooking. If your fans are old and weak, replace them — this is one of the most cost-effective mould prevention investments you can make.
3. Address Condensation on Windows
Wipe down condensation on windows and sills every morning. It takes two minutes and prevents the moisture from dripping into frames and walls where mould takes hold. For long-term solutions, read our detailed guide on stopping condensation during Melbourne’s winter.
4. Never Dry Clothes Indoors Without Ventilation
A single load of washing releases up to five litres of moisture when dried indoors. If you must dry clothes inside, use a room with the door closed, a window cracked open, and a dehumidifier running. Better yet, invest in a condenser dryer or use a covered outdoor area.
5. Use a Dehumidifier Strategically
A dehumidifier is not a set-and-forget solution. Place it in the room with the worst condensation, keep doors to that room closed, and aim to maintain relative humidity below 60 percent. Empty the tank regularly or connect a continuous drain hose.
6. Heat Your Home Consistently
Mould thrives when surfaces are cold enough for condensation to form. Low, consistent heating (even 16-18 degrees overnight) keeps wall and ceiling surfaces above the dew point. Avoid the temptation to leave heating off all day and blast it in the evening — this creates the biggest temperature differentials and the worst condensation.
7. Check and Clear Subfloor Vents
If your home has a subfloor space, ensure all ventilation openings are clear of garden beds, mulch, stored items, and debris. Blocked subfloor vents are one of the most common causes of mould in Melbourne homes with raised timber floors.
8. Manage Wardrobe Moisture
Leave wardrobe doors slightly ajar to allow air circulation. Do not push furniture or clothing hard against external walls. Use moisture absorbers inside wardrobes on external walls and ensure all clothes are completely dry before storing.
9. Fix Leaks Before Winter
That small drip under the kitchen sink or the minor roof leak that only appears in heavy rain will cause serious mould problems over a full Melbourne winter. Fix every leak before the wet season starts. Proper condensation control starts with eliminating all unnecessary water sources.
10. Keep Gutters and Downpipes Clear
Blocked gutters cause water to overflow and penetrate external walls, fascias, and eaves. Clean gutters in March before the autumn leaves peak, and check again in May. Ensure downpipes discharge well away from the house foundations.
11. Mind the Gap Behind Furniture
Pull all furniture at least 50mm away from external walls. Beds, sofas, bookshelves, and desks pushed against cold walls create microclimates where mould grows unseen for months. This is especially important for ceiling and wall mould prevention in bedrooms.
12. Get a Pre-Winter Inspection
If your home had mould last winter, it will almost certainly return this winter unless the root cause has been addressed. A professional inspection before the cold season starts can identify vulnerabilities and recommend targeted interventions. Think of it as a service for your home, just like servicing your car before a long trip.
For a comprehensive overview of tackling mould at every level, our complete guide to mould removal in Melbourne covers everything from prevention through to professional remediation.
Take Action Today
Do not wait until you can see mould growing to take action. Prevention is always cheaper than remediation. We connect you with qualified mould removal specialists across Melbourne who can assess your home’s vulnerabilities and implement solutions before winter hits. Start with our free mould risk assessment tool to check your home’s risk level right now.