Condensation can be an unsightly inconvenience that occurs throughout the colder months, but did you know that it can also lead to damage of your windows? This month, we delve into the common causes of window condensation, and how it can be prevented.

What is condensation?

To put it simply, condensation is the process that refers to water vapour becoming a liquid, in the form of droplets. These water droplets are attracted to cold surfaces once humid air has come into contact with them, which is why it can be seen so commonly throughout colder seasons once central heating systems come into contact with water vapour.

What causes condensation on my windows?

The formation of condensation is commonly caused when a build-up of excess moisture on the cold external surface of your window-pane comes into the contact of the warmer air from inside your home. Much like the process that occurs when you leave an ice cold glass of water in the sun, the condensation can give the appearance of sweating glass, leaving water droplets running down the pane and settling into the seals between the glass, and on your windowsill. This process is a sign of poor insulation.

How can condensation damage my windows?

When these droplets settle on surfaces they can lead to damage. Sitting water in any location could cause an element of decay, and this is exactly what can occur on your window frames – especially if they are wooden. You may notice that, over time, your paint and varnish begin to peel whilst your trims begin to crack and appear visibly beaten.

Both wooden and uPVC frames can be susceptible to other forms of damage, appearing as mildew or black mould. If your windows have thick curtains or blinds closed across them frequently, and your windows are of a poor insulating quality, this mould could find its way indoors. This could be dangerous for your health. Black mould could contribute to the symptoms of asthma or other respiratory issues, causing a health decline in both adults and children.

How can I prevent condensation from appearing on my windows?

A main cause of condensation can be poor ventilation. By improving air circulation within your property, you could balance the humidity both internally and externally. This will help to combat against the risk of condensation. Options such as extractor fans and internal airflow systems can maintain high quality circulation and provide a strong level of safe ventilation. Double glazed windows<link to Windows page> can also double up on the protective barrier, reducing the risk of two contrasting temperatures meeting and leading to the appearance of condensation. Opening your windows regularly will also aid with the reduction of the signs of condensation.

There can be certain locations where the risks of damage are more prominent and taking the correct approaches here could remove the risk. These can be:

  • Your bathroom or wet-room which contain humid environments on a daily basis.
  • Your kitchen windows when cooking in the oven or using the hob.
  • Damp basements which have poor heating, insulation, and ventilation.
  • Windows near washing machines and tumble driers, where warm air is emitted during every cycle.

At 1st Scenic, we excel in delivering a first class service to every customer. For advice and assistance with the health of your windows, get in touch with our team who will be delighted to help. Give us a call on 01689 829 600or email us at