Causes of Window Sealant Mould

Black mould thrives in wet and humid conditions, and so can often be found in high moisture areas in the home. One of the biggest causes of mould growth is condensation. When the warm air inside the home reaches the cooler glass surface of the window, it is rapidly cooled and produces moisture which is known as condensation. This constant presence of water is a haven for mould growth and if left untreated can spread from the window sealant, across walls and paintwork. 

Preventing Mould Growth on Window Sealant

In order to prevent and inhibit mould growth, you need to determine the root of the problem and eliminate the source. 

The three main factors to look at when trying to prevent mould growth are:

• Ventilation

It is important to maintain good ventilation and airflow throughout your home. You can easily improve the airflow in your home by opening the windows throughout the day. It is especially important to do this after using a bath or shower, as this will quickly and effectively cool the room, removing the steam and humidity from the room.

Moreoover, it is essential in high moisture areas such as; kitchens and bathrooms to have an extractor fan fitted in order to remove the excess moisture from the air. These can often be placed on a timer, to switch on periodically, which can be adjusted to times where water usage is higher.

• Moisture reduction

Dehumidifiers can be used to filter out moisture in the air and regulate humidity levels throughout your home, which will help to reduce window condensation. In trying to reduce the moisture level in the air you should avoid drying washing indoors and in poorly ventilated areas.

• Insulation

Implementing draught proofing measures can not only increase your energy efficiency, reducing the cost of your electricity bill but it can also help to control the ventilation in your home. By controlling the airflow throughout your home, the temperature will be more easily controlled, reducing the risk of condensation and thus mould growth.

Summary of the preventative steps you can take to inhibit mould growth:

• Install extractor fans and dehumidifiers in high moisture areas
• Open windows as much as possible
• Regularly clean the sealant
• Regularly wipe down the windows to remove any condensation
• Avoid drying clothes indoors in poorly ventilated areas

Natural Remedies for Mould Removal

Mild issues with mould can be removed at home using natural remedies without requiring the help of a professional. If the mould growth is persistent and spans across a large area it’d be advisable to get in contact with an expert so they can look at the root of the issue and help to safely eradicate the mould at its source.

White Vinegar and Bicarbonate of Soda

Essential Tools:

• White Vinegar
• Bicarbonate of Soda
• Safety Gloves
• Spray Bottle
• Clean Cloths
• Old Toothbrush or Scrubbing Brush

1. Pour a generous amount of the white vinegar into the empty spray bottle. Spray the mould around the window directly, ensuring to saturate it with the vinegar. Leave to sit for at least an hour and do not scrub.
2. Once the vinegar has been sitting on the sealant for a significant period of time, take the old toothbrush or the scrubbing brush and scrub the affected area in circular motions to try and loosen some of the mould.
3. If in some stubborn areas the mould has not shifted, make a thick paste with white vinegar and bicarbonate of soda, and apply generously to the affected area. Leave this to sit overnight, and then try scrubbing the area with either the scrubbing brush or old toothbrush. 
4. After scrubbing, make sure to rinse the affected area with clean water to remove any residue.
5. Repeat steps if necessary.

Specialist Mould Removal Sprays

When using mould sprays, make sure to always follow the manufacturer’s instructions and use the product as directed. To protect yourself, make sure to wear old clothes and safety gloves, as it may damage your skin and stain your clothes. Ensure that children and pets are away from the affected area, and that the space is as well ventilated as possible.

Maintaining a Mould-Free Window Sealant

In order to ensure that mould growth does not return, it is important to maintain the condition of your sealant. 

Here are some essential steps you can take to prevent the recurrence of mould growth:

• Install draught proof measures throughout your home
• Open windows as much as possible to promote airflow
• Place dehumidifiers in areas of high moisture
• Regularly clean your windows from any bacteria, dirt and debris
• Deal with any leaks or damp as quickly as possible.

Professional Mould Removal Services

Mild cases of mould growth can be eradicated via DIY methods however, in severe instances it may be advisable to seek the help of a professional who can remove the mould safely and securely.

Large Areas of Mould Growth

If the affected area has begun to spread from the window sealant to the adjacent walls, it is important to contact an expert who will have the knowledge and the equipment to determine the source of the mould and remove it adequately.

Health Concerns

If you or a family member are suffering with persistent allergic reactions or respiratory problems that seemingly worsen at home, you should contact a professional removal service as it is possible for these health issues to worsen and develop into something more severe under prolonged exposure.

Recurring Mould Growth

If you have recently treated your window sealant for black mould and it has since returned, you should contact an expert to come and have a look at the area, so they can determine if there are any underlying problems causing an issue. Professional mould removal services will also help to put long term solutions in place to inhibit the return of black mould.

FAQ: Common Questions about Mould on Window Sealant

Is mould bad for my health?

Yes, black mould releases toxic compounds called mycotoxins that can cause a variety of health issues. Not everyone may exhibit any symptoms upon exposure however, those with weakened respiratory systems, such as those with asthma, and people with compromised immune systems are at risk from developing more severe health complications. Many individuals may also experience persistent allergic reactions if exposure is prolonged.

Will I need to fully replace my windows if they have mould growth?

The answer typically is no. Black mould predominantly affects the surface area of the window and can be cleaned and treated. However, if your window frames are wooden, there is a chance if left untreated, that the mould can penetrate into the wood and may compromise the integrity of the frame. In this case, it would be advisable to have the frames replaced. It is important to examine the extent of the damage and determine the most suitable solution.

Does heating prevent mould growth?

Turning on the heating will not stop mould from growing, however it may help to remove some of the moisture from the air, which will hamper the conditions for the mould spores to grow and survive. 

It is advisable that instead of turning up the heating, you use an extractor fan or a dehumidifier to lower the levels of humidity in your home as opposed to just increasing the room temperature.