Is Black Mould Around Windows Dangerous?

Friday 24th November 2023

Joanna Grimbley-Smith

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Mould growing next to a window CONTENTS

Black mould around your windows is not just unsightly; it can be a health hazard, too. It may even damage your property and possessions if left untreated.

We offer mould removal services that can make your home safe again. Our technicians have been accredited by Dewpoint Professional, and are available nationwide, 24/7, 365 days a year. If it's an emergency, we can be on site within a matter of hours. 

Keep reading to find out why black mould is growing around your windows and the dangers of being exposed to it.

What causes black mould?

Black mould around windows is a common issue in many homes and is often caused by persistent dampness. Mould grows in environments that contain excess moisture and is typically triggered by high humidity, damp, poor ventilation, and condensation. 

The latter is the main cause of black mould on and around windows. When warm air hits the cold window glass, it condenses to form water droplets, making the window sill the perfect breeding ground for black mould.

This moisture build-up occurs frequently during winter months as we shut our windows to keep out the cold air, resulting in high humidity. Condensation is also common in bathrooms and kitchens where steam is produced when cooking and washing. 

Window sills can provide mould with a food source, too, enabling it to thrive. Mould feeds off organic materials like dust, wood, and dead bugs, all of which can be present depending on what the window sill is made from and how often it is cleaned. 

A badly sealed window allows draughts inside, as well, creating the temperature differences that lead to condensation. You can find out more about what causes black mould in this blog

You may even find black mould growing in the sealant around the windows. This is caused by gaps forming in the sealant, allowing water to get behind it, resulting in a mould problem which spreads across the sealant. 

The dangers of black mould

Mould is dangerous to be exposed to. It produces allergens, irritants, and occasionally some types release toxic substances (known as mycotoxins). Inhaling, ingesting, and touching mould spores can result in a number of health problems like allergic reactions and respiratory infections. 

Some kinds of black mould can produce mycotoxins and are linked to more serious health issues like fatal asthma attacks and sick building syndrome. 

For those with respiratory conditions like asthma or allergies, a weakened immune system, or elderly people, these effects are often more pronounced. 

Black mould around windows poses more specific threats, as well. As you open and close windows, you will be in close contact with the mould, and are more likely to touch or inhale the spores. 

The mould can also easily spread to nearby surfaces like blinds, curtains, and walls, quickly resulting in a large mould problem. You can find out more about the dangers of black mould in here

How to remove black mould from around windows

When it comes to black mould, tackling the issue yourself might seem tempting. Rather than trying to tackle the issue of black mould yourself, it is best left to professionals due to its stubborn nature and associated health risks.

Trying to remove it can bring you in close contact with the mould, increasing the chances of you touching or inhaling it. Some techniques, like scrubbing at black mould, can even aggravate it, causing spores to be released directly into the air. 

Harsh chemicals and removal methods can damage window frames and sealant, too. This could create gaps in the latter, allowing water to get behind it, resulting in more mould growth. 

Professional cleaners can safely and effectively tackle your mould problem. They have the specialist equipment and training to remove all traces of mould from your property without damaging even the most delicate surfaces. They don't just clean the visible problem; they get into hidden areas, too - ensuring thorough eradication. 

You can find out more about how to remove black mould from silicone sealant around windows in this blog

How to prevent black mould around windows

Preventing black mould growth requires a combination of regular cleaning, moisture control, and adequate ventilation. 

Maintaining an indoor humidity level between 30% and 50% is key in keeping mould at bay. Dehumidifiers or air conditioners are useful tools for this task. They not only reduce moisture but also improve air circulation which gets rid of pockets of humid air.

Ventilation is another critical factor. Open your windows regularly - especially after cooking or showering when steam increases room humidity levels significantly. Don't forget to use extractor fans, as well. You should wipe condensation off windows when necessary, too.

If you notice any leaks near window frames, get them fixed promptly as standing water greatly encourages the development of black mould colonies that are harder to eradicate later on.

Frequently asked questions

Is black mould on window toxic?

Some kinds of black mould can be toxic including Cladosporium, Alternaria, and Stachybotrys chartarum.

Is black mould around windows normal?

No - it indicates that there is a moisture problem that needs addressing.

Book your mould remediation today

On top of eradicating all the mould in your property, our technicians can diagnose the root cause of the mould and advise on how to prevent it returning in the future. 

To get your free site survey and no-obligation quote for our mould remediation service, contact our team on 0208 066 0360 or enquiries@icecleaning.co.uk.

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