Bathroom Mould Prevention Guide: Stop It Before It Starts

Your bathroom is the single most common place for mould to start in an Adelaide home. Hot showers pump litres of moisture into a small, often poorly ventilated space — creating the perfect environment for mould colonies. Here’s how to fight back.

Why Bathrooms Are Ground Zero

A single 10-minute shower produces up to 2 litres of water vapour. Without adequate extraction, that moisture condenses on walls, ceilings, tiles, and grout — feeding mould within 24-48 hours. In Adelaide, condensation is worst in winter when wall surfaces are cold.

The 7 Prevention Rules

1. Run the exhaust fan for 15 minutes after every shower (not just during)
2. Squeegee shower walls after each use to remove 80% of surface moisture
3. Open the bathroom window after showering when weather permits
4. Keep the bathroom door closed while showering to contain humidity
5. Seal grout annually to prevent moisture penetrating behind tiles
6. Check for leaks around the shower base, taps, and toilet — even small leaks feed mould
7. Ensure your exhaust fan is adequate — a bathroom needs at minimum 25L/s airflow

Adelaide-Specific Considerations

Many older Adelaide homes in Charles Sturt, West Torrens, and Marion have bathrooms with either no exhaust fan or an undersized ceiling-mounted unit. Upgrading to a properly ducted external exhaust fan is one of the best investments you can make. Bathroom mould removal guide.

If prevention has failed and you’re dealing with established bathroom mould, a professional inspection ensures the problem is fully identified — including any mould behind tiles or inside wall cavities.