Mould on window frames causes both aesthetic and health concerns. Understanding the factors behind mould growth can help you prevent it and keep your home safe and clean.

What Causes Mould on Window Frames?

Excess Moisture

Mould thrives in damp environments. Condensation on windows creates an ideal breeding ground for mould. Poor ventilation and high humidity exacerbate this issue, especially in kitchens and bathrooms.

Poor Ventilation

Rooms with inadequate air circulation trap moisture, leading to condensation on window frames. Without proper airflow, the trapped moisture promotes mould growth over time.

Temperature Differences

Cold window surfaces meet warm indoor air, causing condensation. This moisture settles on the frame, encouraging mould to develop, particularly in colder months.

Organic Material on Frames

Dust, dirt, and organic debris on window frames provide nutrients for mould spores. Even a small buildup can support rapid mould growth when combined with moisture.

Leaky Windows

Gaps or cracks in window seals allow water to seep in, creating damp areas where mould can grow. Leaks also make frames vulnerable to rot and further water damage.

Why Does Mould Prefer Certain Types of Frames?

Wooden Frames

Wood absorbs moisture, making it more susceptible to mould. If left untreated, wooden frames retain water and create a lasting environment for mould growth.

uPVC Frames

Though less porous than wood, uPVC frames still collect moisture and dirt, which can support mould. The presence of condensation on the surface can lead to growth.

Aluminium Frames

Aluminium frames resist mould better than wood or uPVC, but condensation on the surrounding seals or edges may still lead to mould in colder conditions.

Health Risks of Mould on Window Frames

Mould spores release into the air and may trigger allergies, asthma, or respiratory issues. Prolonged exposure increases the risk of long-term health problems, especially in sensitive individuals like children or the elderly.

How to Prevent Mould Growth on Window Frames

Improve Ventilation

Open windows regularly and use extractor fans in high-moisture areas. Proper airflow reduces humidity and keeps windows dry.

Reduce Humidity

Use dehumidifiers to lower indoor moisture levels, especially during winter. Keep indoor humidity below 60% to discourage mould growth.

Clean Window Frames Regularly

Wipe down frames with a damp cloth and a mild cleaning solution to remove dirt and organic debris. Regular cleaning prevents mould spores from finding a foothold.

Seal Cracks and Leaks

Inspect windows for gaps or damaged seals. Repair or replace them to prevent water ingress and moisture buildup.

Insulate Windows

Double or triple glazing helps maintain consistent indoor temperatures and reduces condensation. Insulating films or thermal curtains can also help keep windows dry.

How to Remove Mould from Window Frames

Use a Cleaning Solution

Combine water and white vinegar or a mild detergent. Apply the solution to the mouldy area and scrub gently with a brush or cloth.

Disinfect the Area

After cleaning, use an anti-fungal spray or diluted bleach solution to kill remaining spores. Always wear gloves and ensure good ventilation while cleaning.

Dry Thoroughly

Wipe the frames dry with a clean towel. Remove all moisture to prevent mould from regrowing.

Conclusion

Mould grows on window frames due to moisture, poor ventilation, and temperature differences. Regular cleaning, proper ventilation, and maintaining dry conditions can prevent mould growth. Take action early to protect your home and your health.