Mould thrives in poorly ventilated Melbourne bathrooms. This guide covers exhaust fan sizing, ducting best practices, natural ventilation tactics and moisture management to prevent recurring mould issues.
In this guide
Exhaust Fan Sizing
Minimum 25L/s for standard bathrooms. Larger ensuites need 30-40L/s. Calculate: bathroom volume x 8 air changes/hour.
Ducting Requirements
Rigid ducting outperforms flexible. Shortest run to exterior. Avoid 90-degree bends. Terminate above roof or through wall with flap damper.
Natural Ventilation
Openable windows (600x600mm minimum) supplement mechanical exhaust. Cross-ventilation ideal but rare in bathrooms. Louvred doors aid airflow.
Moisture Management
Run exhaust 10-15 minutes post-shower (timer switch). Squeegee glass screens. Wipe condensation from tiles. Address leaks immediately.
Mould Remediation
Surface mould: vinegar or dilute bleach. Recurring mould indicates ventilation failure or waterproofing breach. Investigate before repainting.
Take these ideas with you.
- Size exhaust to 8 air changes per hour
- Rigid ducting prevents airflow loss
- Timer switches ensure adequate post-shower extraction
- Windows supplement mechanical ventilation
- Recurring mould signals systemic failure
A few more answers
Questions about your next step.
What matters most in a small bathroom layout?
Clearances, door swing, shower placement and vanity depth matter more than decorative choices. Simplify the layout before adding premium finishes.
Which bathroom materials are easiest to maintain?
Low-porosity surfaces, practical grout, well-detailed shower screens and real ventilation reduce cleaning load and mould risk.
How long does a full bathroom renovation normally take?
Bathrooms are tightly sequenced, but waterproofing cure times, tiling and fixture lead times still make them multi-stage projects.
Put your ideas into a plan
Turn this cost guide into a real number
A useful quote names layout, services, finish level and exclusions. We measure in the house, then price the room you actually have.
Battling persistent bathroom mould? Get expert assessment.
