10 Myths Your Boss Is Spreading Concerning Misted Up Double Glazed Unit

· 6 min read
10 Myths Your Boss Is Spreading Concerning Misted Up Double Glazed Unit

Why is My Double Glazed Unit Misting Up?

When condensation appears on the outside of double glazing it is not a problem and in fact, it is a sign that your windows are working correctly and keeping heat in your home. When it appears on the inside of window panes, it is an issue.

The presence of moisture between your windows indicates that the seals have failed, which means you will pay more expensive heating bills and less insulation. This can be due to several reasons.

1. The seals are not working properly

Condensation that is able to get into the space between the glass panes is the most common cause of misting appearing on the outside. The condensation typically appears as a cloudy layer that reduces the transparency of your window. The misting that occurs within your double glazing is much more severe and typically indicates that the seals on the insulation unit have failed.

This signifies that the seal is broken and moisture has found its way in between the two glass panes, which is causing the fogging and decreasing the efficiency of your window. Double glazing that fails can also affect the appearance of your home, as well as the safety of your family.

There are many reasons why your double-glazed units could fail, such as wear and tear, a faulty installation, or problems with the design of your window frame. It is essential to choose an experienced and reliable installation company that will stand behind their work and not invalidate any warranties from the manufacturer.

Water damage is one of the most frequent reasons for double-glazed units to fail. It could be due a poor installation, or a lack of drainage or spacer blocks. The moisture can then seep into the seals, causing them to break over time. This leads to condensation between the glass panes.

Another reason for a failure of a double glazed unit is that the desiccant within the unit becomes saturated. The desiccant is designed to suck up excess moisture, and prevent it from leaking into the space between the glass panes. However, once it is saturated, the desiccant will lose its capacity to absorb water and eventually, the moisture between the glass will increase, which can cause the mist that is commonly seen.

The most common sign of this is when you start to notice the formation of moisture on the aluminium strip within the gap. This is not a simple fix and it is best to replace the entire unit. Hairdryers are a great tool to use on a regular schedule to get rid of condensation from your windows. This is especially beneficial in areas of high humidity and condensation. A dehumidifier is an excellent option to add to your home to stop the build-up of moisture and to keep it dry.

2. Poor Ventilation

Condensation can form on double-glazed windows due to many reasons. Condensation that is visible on the outside of windows is generally an indicator of positive quality, as it means that your windows are performing well and keeping warm air inside and cold air out.

If you see condensation in your window, this could indicate a problem. The condensation inside your windows is a sign that the seals are damaged and moisture can enter between the glass panes.

The reason is often poor air circulation in the room. Without air flow the warmth inside your home is sucked up and this causes moisture to build up. This is a common problem in kitchens and bathrooms in kitchens, where there is a high level of humidity. If you have a double-glazed window that is misty, it's vital to examine the ventilation and reduce excess humidity in the area to stop condensation from forming.

Double glazing seals that aren't working properly can also increase energy bills. This is because your heating system will have to work harder in order to keep your home warm, and this could increase over time. Additionally, leaks in double glazing can let cold air into your home, which can make it feel much colder.

Check your double-glazed windows regularly to ensure that the seals are in good condition. If you regularly clean your windows with an agent that is not chemical and don't let them get too wet and the seals will likely to last for a long time.

If you notice that a fog is building up on the double-glazed unit, it may be time to replace it. The good part is that if you make the right choices, you can replace your current double glazing for a fraction of the cost of a new window. This is not always the best option when your window frame cannot support double-glazed units. In this situation you'll need to install a new window.

3. Faulty Installation

If you've recently put in double glazing and it is beginning to mist, this could be because of a poor installation. To ensure that your windows are compliant with UK building standards, it is crucial to use a FENSA-regulated installer. Incorrect installation can cause the window seals to fail, allowing moisture between the panes. This could cause the internal aluminium spacer bars to corrode, which will result in the sealant within the unit to fail. This will cause the anti-moisture granules within the spacer bar to be saturated with moisture and will no longer function as efficiently as they ought to.

If you notice condensation on the side facing your room, it is a sign that there is a ventilation issue in that room or property. It could be a combination and it's not unusual for double glazing to have some condensation on the outside, if you are using a sealed unit with high-quality Argon fill. However, this will go away when the glass is heated and the temperature of the air rises.

If you notice condensation in the panes of the window, then the window is defective and needs to be replaced. Faulty double glazed windows no longer insulate your home as well as they should, leading to more expensive energy bills and causing damage to the frame of the window.

While it may be a bit frustrating it is important to replace your double-glazed windows when the sealant starts to fail. It is best to have the replacement carried out in the summer months before winter arrives to benefit from the increased thermal efficiency of your double-glazed windows.

The lifespan of a double glazed window should be between 10 and 35 years, but a number of reasons can cause them to fail earlier than this. Faulty seals let moisture into the window and cause it to fog or mist up, this can be caused by a range of reasons, like:

4. Age

Double glazed units are an effective and airtight method of insulate your home while preventing condensation. The secret lies in the space between the two panes of glass that is sealed under vacuum conditions with inert gas or dehydrated air and protected by seals on the primary and secondary sides. This reduces heat loss, keeping your home warmer and decreasing your energy costs.

Over time, as a result of normal wear and tear, the seals on your double glazing could weaken allowing moisture to enter the space between the windows.  misty window  can be due to various weather conditions. For example, when temperatures rise or fall and the gasses in the units expand and contract. As time passes this causes the seals to break which allows moisture to enter the cavity.


Misted windows can negatively impact the aesthetics of your home however, they also decrease visibility. If they're not taken care of, they can also lead to the growth of mould and mildew. This could be detrimental to your health, and can damage the frames of your windows.

If you're seeing that your double-glazed windows are becoming increasingly cloudy or misty, it's probably time to get them replaced. A damaged window is not just unsightly, but will allow the cold to penetrate your home and significantly increase your energy bills.

Older double glazing doesn't provide the same insulation as newer models, meaning they allow more noise in, which could affect your living quality, particularly when you live near the busy highway or railway line. Double-glazed windows are made for noise reduction and heat retention, enhancing the comfort of your home.

Windows that are misted are a typical problem that is easily fixable by a professional double glazing company. It is important to determine if your window is under warranty prior to having it repaired or replaced, based on the severity of the problem you may be able replace the glass component instead of changing the entire frame.