Mould in the bathroom isn’t just unsightly — it can damage your walls, ruin finishes, and even affect your health. Bathrooms are prime breeding grounds for mould due to high humidity, poor ventilation, and regular water exposure.
In this article, we’ll show you exactly how to prevent mould growth, from daily habits to long-term renovations. 🧽💧
🧫 Why Does Mould Grow in Bathrooms?
Mould thrives in environments that are:
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Damp 💦
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Poorly ventilated 🌬️
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Warm 🌡️
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Dark or shaded 🌑
Your bathroom checks all those boxes, especially after a steamy shower. If left untreated, mould can spread on:
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Grout and silicone 🧱
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Ceilings and walls 🎨
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Under sinks and behind toilets 🚽
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Bathroom cabinets and windowsills 🪟
🚿 Step-by-Step Guide to Prevent Mould Growth
1. ✅ Improve Bathroom Ventilation
The number one cause of mould is trapped moisture. Here’s how to ventilate effectively:
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Install an extractor fan rated for bathrooms (with a humidity sensor if possible)
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Run the fan during and at least 20 minutes after every shower
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Open windows if available, even in winter
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Leave the door slightly open after use to allow airflow
💡 Pro tip: Clean your extractor fan regularly to keep it working efficiently.
2. ✅ Wipe Down Surfaces After Showers
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Use a squeegee to remove excess water from glass and tiles
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Wipe mirrors, countertops, and windowsills
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Dry the bathtub, sink, and floors as needed
This simple habit can drastically reduce moisture levels in the air.
3. ✅ Use Mould-Resistant Materials
If you’re renovating or building, consider:
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Mould-resistant drywall (green board or cement board)
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Waterproof paint or tile backer boards
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Anti-mould grout and silicone sealants
🛠️ These materials are designed to resist the damp environment of bathrooms and last longer.
4. ✅ Control Humidity Levels
Humidity above 60% encourages mould. Use:
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A hygrometer to monitor bathroom humidity
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A dehumidifier, especially for bathrooms with no windows
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Houseplants that absorb moisture, such as Boston fern or peace lily 🌿
5. ✅ Keep the Bathroom Bright and Dry
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Let in natural light where possible
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Install LED lighting to discourage mould in dark corners
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Don’t pile wet towels or clothes — hang them to dry properly
6. ✅ Clean Regularly with Anti-Mould Products
Use mould-prevention sprays or natural alternatives like:
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White vinegar
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Baking soda paste
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Hydrogen peroxide
Focus on high-risk zones, including:
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Tile grout
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Around taps and showerheads
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Behind toilet bases
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Inside cabinets and under sinks
⚠️ Signs of Mould to Watch For
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Musty smell 👃
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Black, green, or grey patches on walls or ceilings
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Peeling paint or bubbling wallpaper
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Recurring condensation on windows
Act fast when you see these signs — early mould removal is easier and less expensive.
🚫 Mistakes to Avoid
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Relying on bleach only: Bleach can lighten stains but doesn’t always kill spores
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Ignoring small leaks: A dripping tap or leaking toilet can cause hidden mould
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Skipping ventilation: Even in winter, airflow is essential
💵 How Much Can Mould Cost You?
If ignored, mould can:
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Require costly wall and floor replacements
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Cause damage to electrical wiring
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Lower your property value during sale or rental
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Lead to medical costs from respiratory issues
Prevention is always cheaper than remediation.
🧼 Bonus: Weekly Bathroom Mould Prevention Checklist
✅ Turn on fan or open windows daily
✅ Squeegee tiles and mirrors after shower
✅ Wipe sink and surfaces
✅ Wash towels and bath mats
✅ Check for leaks under the sink
✅ Spray mould-prone areas with anti-mould solution
🧠 Conclusion
Preventing mould in your bathroom is all about moisture control and cleanliness. With the right ventilation, materials, and habits, you can keep your bathroom healthy, fresh, and mould-free — no matter how steamy your showers get! 🚿✨
Ready to upgrade your bathroom’s ventilation system or need help selecting mould-resistant materials? Let us know — we’ll help you breathe easier!
