Why is My Double Glazed Window Misted?
Double glazing is an excellent method to boost the efficiency of your home and ensure maximum energy efficiency. However, if you notice your windows misting then it's usually a sign of a broken window seal.
This allows moisture into the insulation area of your windows, which can decrease their performance drastically. Fortunately, this issue is quite easy to resolve.
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It's possible to get condensation on double-glazed windows, especially when it is very cold and stormy. This is a indication that your double-glazed windows are keeping out the cold but also let in warmth. You can wipe it away or let it clear on its own.
If your double glazed window is leaking on the inside though, this is more of an issue. This is a sign of a broken seal or malfunction in your double glazing. Moisture can enter between the two panes of glass in double-glazed units that have failed. The argon,xenon orkrypton gases that are employed in these units could also leak out. After this happens the high-density gases lose their insulation properties and your window will no longer function as an enclosed unit.
Natural wear and tear is one of the main reasons that cause seals to fail on windows. This is caused by the constant expansion and contraction of the gases inside your double-glazed windows as temperatures rise and fall. Double glazing seals can be damaged by using abrasive chemicals on them.
If the seal of your double-glazed windows has failed the warm air could escape between the glass panes and cool air could enter, causing moisture buildup on the bars that hold the glass unit. This is often referred to as a 'blown' window and it can cause costly energy bills during winter.
This problem can be solved by replacing the glass units in your double-glazed windows. This is a cheaper solution than replacing the whole window, and can guarantee that your home is properly insulated and sealed. It is also a good idea to check that the company you choose to replace your double glazed windows is properly insured, as this can protect you in the event of unexpected problems regarding the installation.
What is the reason for this?
Condensation within double glazing isn't just unsightly but can also result in mildew that will ruin timber window frames. In extreme instances, black mold can also develop on window frames and cills which can be harmful to you or your family.
Understanding the reason for condensation is crucial to understanding how to best deal with it. Condensation occurs when the temperature of the glass drops below the dewpoint - the temperature at which the water vapour from the air turns into liquid water. It is therefore common to observe it at late at night or in the early morning when the dewpoint is high and the temperature of the air is higher than the glass surface.
Condensation in double-glazed windows will be more common as the weather becomes colder and humidity levels increase. In the majority cases it's a normal occurrence and does not indicate a problem with your double-glazing. If the condensation only appears on the outside of the window and disappears once the sun comes up there is no reason to be concerned.
Double glazed windows that are damaged or defective will not insulate as well as they should, which could result in higher prices. If the seals are damaged then moisture could pass through the two glass panes and eventually cause a misting effect.
The causes that cause misted double glazing are many but there are a few major causes that are worth looking for:
When you see condensation on the inside of your window, it is usually the first sign that something is wrong. Water stains or glass damage caused by trapped moisture in between the two panes could be the next step. This could be due to a problem during installation or even wear and tear over time. This could mean that your window is nearing the end of its lifespan and needs to be replaced in order to increase the insulation performance of your home.
How can I get rid of it?
Double glazing is a great investment to improve the efficiency of your home's energy usage and the appearance of your windows. However, if your double glazing is misty or cloudy, it can ruin the appearance of your windows. Thankfully, the answer to this issue is simple and cost-effective. Double glazing that is misted is caused by condensation and water entering the space between the panes of your double glazed window that must be sealed air-tight. This is normally a sign of a broken seal inside your window and is in need of fixing.
Condensation on the outside of double-glazed windows that are brand new is normal, particularly in cold weather. This occurs when the glass is chilled by air that has reached its dewpoint. The water vapour will be visible when it reaches the cold surfaces on your windows. It will disappear as soon as the glass warms back up.
Generally, it is only when your double glazed windows are misting inside that you realize this is an issue and something needs to be done to fix it. The condensation is a sign that the seal between the two glass panes has been damaged. It can be an indication of inadequate installation or chemicals in cleaning products.

There are several methods to eliminate the condensation on your double-glazed windows. You can wipe them clean with a damp cloth to remove the condensation. You can spray them with a glass cleaner that is designed to remove the haze caused by condensation. You can also use the dehumidifier inside your home, which will help to take the moisture away and prevent it from building up on windows.
There are professional steps that can be taken to repair your double-glazed window mist. This involves drilling a small hole in one of the windows and pumping into a specially-formulated desiccant which helps dry out the window and prevent further problems. This can be dangerous and should only be carried out by an expert. This method will restore your double glazed windows to their original condition and will ensure that you don't face issues with misting or condensation in the future.
What is the best choice?
Condensation is a common feature on the exterior of new double-glazed windows. This is a sign that your windows are working well. It can be easily removed. The condensation is caused by the temperature difference between the air in the house and the cold glass of the windows.
If you notice condensation between double-glazed glass panes, this is not normal. You must take immediate action. The window seal has been damaged and moisture may enter the space between the glass panes. This could result in the windows losing their insulation properties, which will reduce the energy efficiency of your home.
The most effective way to prevent condensation from your double-glazed windows is to increase the ventilation within your property. Opening the windows on a daily basis will help to reduce humidity levels and allow fresh air to circulate through your home. In areas with an abundance of moisture, like bathrooms and kitchens extractor fans are recommended. Dehumidifiers can also be used to remove excess moisture from the air and keep condensation on cold surfaces like window glass.
Another method of reducing condensation in double-glazed windows is to clean the glass using an anti-fogging solution. These products are available in a majority of hardware stores and are designed to prevent the build-up of moisture. It is crucial to remember that these solutions aren't long-lasting and will need to be applied periodically.
If your double-glazed windows remain covered by warranty, calling a professional installer is the best way to solve the problem. It is recommended to choose a FENSA licensed company since they will provide a 10 year warranty and abide by UK Building Regulations.