How to Prevent Black Mould on Windows

Black mould around your windows can be a persistent and unsightly problem. It not only impacts the visual appeal of your home but can also have adverse health effects. In this guide, we’ll explore why black mould forms around windows, its potential dangers and how you can prevent it. Plus, we’ll answer the question of whether it’s safe to remove black mould removal yourself.

Why Am I Getting Black Mould Around My Windows?

Black mould, often referred to as Stachybotrys chartarum, is a type of fungus that thrives in damp, humid conditions. When it comes to your windows, there are a few common reasons why it might make an appearance, including condensation, leaky windows and poor ventilation.


  • Condensation: Moisture buildup on your windows due to temperature differences between the indoors and outdoors can create a perfect environment for black mould growth.
  • Leaky Windows: If your windows are not properly sealed or have cracks, rainwater can seep in. This moisture can promote mould growth, especially in the hidden crevices of your window frames.
  • Poor Ventilation: Inadequate airflow in your home can trap moisture, providing an ideal breeding ground for black mould. Rooms that lack proper ventilation, like bathrooms and kitchens, are particularly susceptible.


Is Black Mould Around Windows Dangerous?

Yes, black mould is dangerous. It isn’t just an eyesore; it can also have health implications, especially for those with allergies, asthma or weakened immune systems. The mycotoxins, the harmful substances produced by black mould, can lead to respiratory issues, headaches and skin irritation. So, addressing the problem promptly is crucial for your well-being.

Is It Safe to Clean Black Mould Yourself?

While small patches of black mould can often be addressed by homeowners, it’s essential to take safety precautions. Use protective gear such as gloves, a mask and eye protection to avoid inhaling or coming into contact with mould spores. Also, consider hiring professional mould removal services for the best results.

How to Prevent Black Mould from Forming on Windows

Now that we understand why black mould appears on windows and its potential dangers, let’s explore how you can prevent it from forming:


  • Regular Ventilation: Proper airflow is your ally in the battle against black mould. Open your windows frequently to allow fresh air to circulate, especially during humid periods.
  • Humidity Control: Invest in a dehumidifier to maintain indoor humidity levels between 30% and 50%. This helps to deter mould growth.
  • Seal Cracks and Leaks: Regularly inspect your windows for gaps and cracks. Seal them with caulk or weatherstripping to prevent moisture from entering.
  • Cleaning Routine: Regularly clean and wipe down your windowsills and frames with a mixture of white vinegar and water. This natural mould remover can help keep mould at bay.
  • Use Exhaust Fans: Install exhaust fans in high-humidity areas like bathrooms and kitchens. These fans help remove excess moisture, reducing the chances of black mould growth.
  • Monitor Houseplants: Be mindful of indoor plants. Overwatering can lead to excessive moisture in the soil, which creates conditions favourable for mould. Ensure proper drainage and avoid overwatering.
  • Repair Leaks Promptly: If you notice any signs of water leaks around your windows, such as stains or peeling paint, address the issue promptly. Fixing leaks not only prevents black mould on windows but also preserves the integrity of your home.


Frequently Asked Questions

Q: Is it ok to touch black mould?

A: It’s best to avoid touching black mould with bare hands as it can release harmful spores and mycotoxins. If you need to handle it, wear protective gear like gloves and a mask.

Q: Is it safe to sleep near black mould?

A: Sleeping near black mould is not recommended as it may lead to health issues, especially if you have respiratory conditions or allergies. It’s crucial to address and remove the mould promptly.

Q: What stops black mould from growing?

A: Preventing black mould growth involves controlling humidity levels, ensuring proper ventilation, sealing cracks and maintaining a clean and dry environment in susceptible areas like bathrooms and kitchens.

Q: How do you get rid of mould on window sealant?

A: To remove mould from window sealant, use a mould cleaner, then scrub the affected area with a brush or sponge. Rinse and dry thoroughly. You can also hire professional mould removal services to get rid of mould.

Q: How do you stop black mould from spreading?

A: To prevent black mould from spreading, isolate the affected area, fix any moisture sources or leaks and clean the mould using appropriate products. Maintain proper ventilation and reduce humidity levels in your home.

Q: How do you permanently remove mould from windows?

A: Permanently removing black mould from windows involves following a strict cleaning routine using mould removers, regular maintenance and preventing moisture buildup are key. For a comprehensive and lasting solution, consider professional mould removal services.

Q: How do you prevent moisture in windows?

A: Preventing moisture in windows entails proper insulation, sealing gaps, using exhaust fans in high-humidity areas and maintaining a consistent indoor temperature to reduce condensation.

Q: How do you stop black mould from forming on windows?

A: To prevent black mould from forming on windows, maintain good ventilation, control indoor humidity, seal any gaps or cracks and clean your windows and frames regularly using mould-preventing solutions.

Q: How do you stop moisture from forming on a window without ventilation?

A: In cases where ventilation is limited, use a dehumidifier to reduce indoor humidity levels. Additionally, consider using moisture-absorbing products near windows to help control moisture.

Need Mould Gone? We’ve Got You Covered!

While these prevention tips can help you maintain a mould-free home, sometimes you may need professional mould removal services. At The Mould Doctor, we understand that black mould can be a persistent problem. That’s why we offer reliable and expert mould removal services that go beyond the surface.

Our team of highly trained technicians is equipped with the latest tools and techniques to ensure thorough mould removal, addressing not only the visible signs but also the hidden sources. We prioritise your safety and well-being, and our services are designed to provide you with a safe and healthy living environment.

For more details about our services, contact us today.

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