How Poor Ventilation Causes Mould — And What to Do About It
Ventilation is the single most effective weapon against mould. Yet most Adelaide homes — especially older ones — have inadequate ventilation for modern living. Here’s why it matters and what you can do.
The Ventilation-Mould Connection
Modern life generates enormous moisture: showers, cooking, breathing, drying clothes. Without adequate air exchange, this moisture accumulates and condenses on cold surfaces. Adelaide homes sealed for energy efficiency often trap humidity levels above 60% — the threshold where mould growth accelerates. Condensation control guide.
Signs of Poor Ventilation
- Bathroom mould that returns within days of cleaning
- Persistent condensation on windows
- Stuffy or stale-smelling rooms
- Visible mould in corners and ceiling junctions
Solutions by Cost
Free: Open windows for 15 minutes daily (cross-ventilation). Keep trickle vents open. Don’t block existing air vents.
Low cost ($100-$500): Upgrade bathroom exhaust fans. Install window vents. Add a hygrometer to monitor humidity.
Medium ($500-$3,000): Install subfloor ventilation systems. Add roof ventilation. Install a whole-house dehumidifier.
High ($3,000+): Mechanical heat recovery ventilation (MHRV) system for whole-home continuous fresh air exchange.
Assess your home’s risk and get professional advice.
Need Help with Mould in Your Adelaide Home?
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