Why is My Double Glazed Window Misted?
Double glazing is a fantastic way to improve the efficiency of your property and secure optimal energy efficiency. If you notice that your windows are misting this could be an indication that the seal on your window has broken.
This can allow moisture to get into the insulation area of your window and could drastically decrease their performance. Luckily, this issue is fairly simple to fix.
What is it?
It is possible to experience condensation on your double-glazed windows, especially when it's cold and stormy. This is a normal indication that your windows are operating well, keeping cold out and the heat in. You can clean it up or let it clear by itself.
If your double-glazed window mists on the inside this is more of an issue. This is usually a sign that the seal on your double glazing has failed or 'failed' as it is known in the field. Moisture may get in between the two panes of glass in the case of a double-glazed unit that has failed. The argon, xenon, or krypton gases that are used in these units may also escape. Once this occurs the high-density gasses lose their insulation properties, and your window ceases to function as a sealed unit.
misted double glazing repair of the primary reasons for a window's seal to wear out is normal wear and tear that occurs over the years. The constant expansion and contraction in double-glazed windows is caused by temperature fluctuations. Utilizing chemical cleaners that contain abrasives on your double glazing can also cause damage to the seal, and lead to it failing over time.
If the seal on your double glazed windows has failed it means warm air can escape from between the glass panes and cool air could enter and cause the condensation of moisture to occur on the spacer bar inside the glass unit. This is often called a blown' window and it can result in expensive energy bills in winter.
Replacing the glass units in your double glazed windows can solve this issue. This is a much more cost-effective solution than replacing the whole window and it can ensure that your home is properly protected and insulated. It is also important to ensure whether the company who is who is replacing your double-glazed windows is insured. This will safeguard you in the event of any unexpected problems.
What is the reason for this?
Condensation inside double glazing isn't just ugly but it can also result in mildew which will deteriorate timber window frames. In extreme cases black mould can even grow on window frames as well as cills which isn't good for you or your family.
It is important to understand the cause of condensation to get to grips with how best to deal with it. Condensation occurs when the surface temperature of a glass falls below the dewpoint - which is the temperature at which water vapour in the air transforms into liquid water. This is why it usually occurs during the night or early in the morning, when the dew point is at its highest and the air outside is warmer than the glass surface temperature.
Condensation within double-glazed windows is likely to be more common as the temperature drops and humidity levels increase. In the majority cases it's a normal occurrence and doesn't indicate a problem with your double-glazing. If the condensation is visible from the outside of your window and disappears once the sun rises, there is no need to worry about it.
Damaged or defective double-glazed windows aren't able to effectively insulate your home as they should and this could result in more expensive energy bills. If the seals are damaged, water can be able to get into the panes and cause a misting.
The causes of the problems that cause misted double glazing are many but there are a few major causes that are worth looking for:
The first indication of a problem with double-glazed windows is when you observe condensation developing on the inside of the window. The next step is when you observe water stains or damage to the glass caused by trapped moisture between the two glass panes. This could be due to damage from installation, or simply gradual wear and wear and tear. This could be an indication that your window is approaching the end of its life and needs to be replaced in order to improve the insulation efficiency of your home.
How can I get rid of this?
Double glazing can improve the efficiency of your home's energy usage and also enhance the appearance of your windows. However, if your double glazing is misted 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 moisture and condensation getting into the space between the panes of your double-glazed window, which should be sealed air-tight. This is usually a sign that your window seal is damaged and needs to be repaired.
Condensation on the exterior of new double-glazed windows is normal, particularly in cold weather. This happens when the glass is cooled down by the air that has warmed up and reached its dew point. When this water vapour hits the cold glass surface it is visible and disappears once the glass warms up again.
It is usually the case that double-glazed windows are leaking that you realize this is an issue and something has to be done about it. The condensation indicates that the seal between the two glass panes is damaged. It can also be a sign of a inadequate installation or chemicals in cleaning products.
To get rid of condensation on your double glazed windows, there are many methods you can try. You can try wiping them clean with a damp cloth. This usually removes the condensation. You can also spray them with glass cleaner specifically designed to eliminate condensation haze. You can also install the dehumidifier inside your home, which will help to absorb moisture and stop it from accumulating on windows.
Professional steps can be taken to repair double-glazed mist. This involves drilling a hole through one of the windows, and then pumping a desiccant in the window. This will dry out the glass and stop future problems. However, this is risky and should only be carried out by a qualified professional. This solution will restore the double-glazed windows back to their original state and guarantee that you don't face any condensation or misting problems in the future.
What is the best choice?
Condensation is common on the outside of modern double-glazed windows. This is a sign that the windows are working efficiently and it can easily be removed. The condensation is caused by the difference in temperature between the air inside the house and the cold glass of the windows.
If you notice condensation between double-glazed glass panes this is not normal. It is imperative to immediately take action. The window seal is damaged and moisture may enter the space in between the glass panes. This can cause the windows to lose their insulation properties and affect the energy efficiency of your home.

The best way to reduce condensation on double-glazed windows is to increase the ventilation in your home. Opening the window regularly will lower humidity levels and allow fresh air to circulate around your home. In areas with lots of moisture, like kitchens and bathrooms extractor fans are recommended. Dehumidifiers are also useful for actively eliminating excess moisture from the air and keeping it from condensing onto cold surfaces, like window glass.
Cleaning the glass of your windows with anti-fogging products is another effective method to reduce condensation in double-glazed windows. These products are readily available in most hardware stores and are designed to stop the build-up of moisture. However it is important to note that these solutions are not permanent and will require reapplication on a regular basis.
If your double-glazed windows are still covered by warranty, getting in touch with an experienced installer is the best way to solve the problem. A FENSA-regulated firm will offer a 10-year guarantee and comply with UK Building Regulations.