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How to Stop Mould, Mildew, and Damp in Your Bathroom

Mould, mildew, and damp in your bathroom can be both unsightly and harmful to your health if left untreated. The high levels of moisture in bathrooms, coupled with inadequate ventilation, create an environment that is perfect for the growth of mould and mildew. Dampness can also cause damage to your bathroom’s structure, such as peeling paint, warped cabinets, and even rotting wood. In this article, we’ll explore how to stop mould, mildew, and damp in your bathroom. 

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Improve ventilation 

The first step in preventing mould, mildew, and damp in your bathroom is to improve ventilation. Poor ventilation traps moisture in the air, creating an environment conducive to the growth of mould and mildew. Ensure your bathroom has adequate ventilation by installing an exhaust fan that vents to the outside. The fan should be left on for at least 30 minutes after a shower or bath to remove moisture from the air. If you don’t have an exhaust fan, open a window or use a dehumidifier to reduce humidity levels. 

Clean regularly 

Regular cleaning is essential in preventing mould and mildew. Bathroom surfaces should be cleaned with a solution of water and bleach, vinegar, or a commercial anti-mould cleaner. Scrub the shower, bathtub, and tiles regularly to remove any dirt or grime that may provide a breeding ground for mould and mildew. Cleaning should also extend to bathroom fixtures such as taps, handles, and showerheads, which can harbour bacteria and mould. It is essential to dry surfaces after cleaning to prevent dampness. 

Keep surfaces dry 

Keeping surfaces dry is crucial in preventing mould and mildew growth. Use a squeegee to remove excess water from the shower or bathtub after use, and wipe down countertops and sinks with a dry cloth. Ensure that towels are hung up to dry after use and not left on the bathroom floor, where they can contribute to dampness. 

Fix leaks promptly 

Any leaks in the bathroom, such as from the sink, shower, or toilet, can cause dampness and encourage mould growth. If you notice any leaks, fix them promptly to prevent water damage and mould growth. If you have a leaky showerhead, replace it with a low-flow showerhead to reduce water usage. 

Use a humidity monitor 

A humidity monitor can help you keep track of the moisture levels in your bathroom. If the humidity levels are consistently high, consider installing a dehumidifier or improving ventilation to reduce moisture levels. It is recommended that humidity levels be kept below 50% to prevent the growth of mould and mildew. 

Choose mildew-resistant materials 

Certain materials are more resistant to mildew and mould than others. When designing or renovating your bathroom, consider using tiles, paint, and wallpaper that are specifically designed to resist mould and mildew growth. Avoid using wallpaper in high-moisture areas such as the shower or bathtub. Choose grout that is resistant to mould and mildew and clean it regularly to prevent dirt and moisture build-up. 

Keep clutter to a minimum 

Clutter in the bathroom can restrict airflow and make it difficult to clean surfaces effectively. Keep bathroom essentials to a minimum and store them in well-ventilated areas to prevent mould and mildew growth. Avoid using fabric shower curtains that can trap moisture and harbour bacteria. Instead, opt for a plastic or vinyl shower curtain that can be easily cleaned. 

Maintain your bathroom regularly 

Regular maintenance of your bathroom is essential in preventing mould and mildew growth. Check the caulking around the bathtub, shower, and sink regularly for signs of wear or damage. Replace any damaged caulking promptly to prevent water from seeping into walls or floors. Check the exhaust fan regularly to ensure it is working efficiently and clean the vent cover to remove any dust or debris that may be obstructing airflow. If your bathroom has a window, check the seals for signs of wear or damage and replace them if necessary. 

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Keep the bathroom door open 

Leaving the bathroom door open can improve ventilation and airflow, reducing the chances of mould and mildew growth. If possible, keep the bathroom door open when you’re not using it to allow air to circulate freely. This will help to reduce humidity levels and prevent the growth of mould and mildew. 

Address underlying issues 

If you’ve tried all of the above steps and are still experiencing issues with mould, mildew, or dampness in your bathroom, it may be time to address any underlying issues. Check for any water damage or leaks behind walls or under the floor, which may be causing moisture to accumulate in the bathroom. Consider contacting a professional plumber or contractor to help you identify and address any structural issues. 

Use natural remedies 

There are many natural remedies that can help prevent mould and mildew growth in your bathroom. Tea tree oil is a natural anti-fungal agent that can be added to water or cleaning solutions to kill mould and mildew. A mixture of baking soda and water can also be used to clean surfaces and remove mould and mildew stains. Additionally, keeping a bowl of white vinegar in your bathroom can help absorb moisture and prevent mould growth. 

Use a mould-resistant shower curtain liner 

Shower curtains can be a breeding ground for mould and mildew, especially fabric curtains. Consider using a mould-resistant shower curtain liner, which is made of materials that resist mould and mildew growth. These liners can be easily cleaned and replaced when needed. 

Install a waterproof membrane 

Installing a waterproof membrane beneath your bathroom tiles can help prevent moisture from seeping into the walls or floors. This membrane acts as a barrier to prevent water damage and mould growth. Consider installing a waterproof membrane when renovating your bathroom or replacing the tiles. 

Consider a bathroom fan timer 

A bathroom fan timer can help ensure that your exhaust fan is left on for the appropriate amount of time after you’ve finished using the bathroom. This can help prevent moisture from building up and reduce the chances of mould and mildew growth. A timer can be installed easily and can help save energy by turning off the fan automatically after a set period. 

Use a mould-resistant paint 

Using a mould-resistant paint on your bathroom walls can help prevent mould and mildew growth. These paints contain anti-fungal agents that inhibit the growth of mould and mildew. They are also designed to resist moisture, making them a great choice for high-moisture areas such as bathrooms. 

Address plumbing issues promptly 

Any plumbing issues in your bathroom, such as leaks or clogs, can contribute to moisture buildup and mould growth. Address plumbing issues promptly to prevent water damage and mould growth. Consider having your plumbing system inspected regularly by a professional to identify and address any underlying issues. 

Do you have a blocked drain? Read our 9 tips for clearing a blocked drain by the blocked drains Perth experts. 

Why is it important to prevent mould, mildew, and damp in your bathroom? 

It’s important to prevent mould, mildew, and dampness in your bathroom for several reasons: 

  • Health concerns: Mould and mildew can cause health problems such as allergies, respiratory issues, and skin irritation. Dampness can also cause an increase in dust mites, which can trigger asthma symptoms. 
  • Structural damage: Mould and mildew can cause structural damage to your bathroom and home, such as rotting of wood, wallpaper or paint peeling, and deteriorating caulking or grout. This can lead to costly repairs or even compromise the structural integrity of your home. 
  • Aesthetics: Mould and mildew can be unsightly and can make your bathroom look dirty and unkempt, even if it’s regularly cleaned. It can also cause unpleasant odours, making your bathroom an unpleasant place to be. 
  • Resale value: If you’re planning to sell your home in the future, potential buyers may be turned off by the presence of mould and mildew in your bathroom. A well-maintained and clean bathroom can increase the resale value of your home. 


Preventing mould, mildew, and dampness in your bathroom requires a combination of regular cleaning, proper ventilation, and maintenance. Mould and mildew can cause health problems, structural damage, and reduce the resale value of your home. By following the tips mentioned in this article, you can keep your bathroom clean, healthy, and free from the harmful effects of mould and mildew.  

To ensure the safety and health of your family and home, address any persistent issues with mould, mildew, or dampness in your bathroom promptly. Fremantle Plumbing offers a range of plumbing services, including bathroom repairs, installations, and maintenance to keep your bathroom in top shape. Our licensed plumbers use the latest techniques and equipment to diagnose and fix underlying issues. Contact us to learn more about our services or schedule an appointment online today. 

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