10 Things We Love About Misted Up Double Glazed Unit

· 6 min read
10 Things We Love About 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 an issue, in fact it shows that your windows are working correctly and keeping heat in your home. If it appears on the inside of windows, it is an issue.

The condensation that is forming between your windows indicates that the seals have failed, which means you will pay more expensive heating bills and less insulation. It could be due to several factors.

1. The seals are not working properly

Mist that forms on the exterior of your windows is often caused by condensation that has made its way into the space between the glass panes. The condensation typically appears as a cloudy layer and reduces the transparency of your window. The misting that occurs in double glazing is much more severe and is a sign that the seals of the insulation unit are failing.

This indicates that the seal has broken and moisture is leaking between the two panes of glass. This causes fogging, which reduces the efficiency of your window. Double glazing that fails can also impact the appearance of your home and the safety of your family.

There are a variety of reasons your double-glazed units could fail, such as natural aging and wear as well as a poor installation or issues with the design of your window frame. It is essential to only use an established installation company that will warrant their work and not invalidate any warranty provided by the manufacturer.

One of the primary reasons your double glazed units may fail is because they've been damaged by water. This could be the result of poor installation, or maybe a lack of drainage or spacer blocks. The moisture then begins to penetrate and over time, it can cause the seals to break down, leading to the onset of condensation between the glass panes.

A common cause of the failure of a double-glazed device is that the desiccant in the unit becomes saturated. The desiccant absorbs moisture and stops it from entering the gap between glass panes. When it is saturated, the desiccant loses its ability to absorb moisture, and the gap between the panes will grow.

Often the first sign of this is when you begin to notice moisture forming on the aluminium strip within the gap. It is crucial to know that this is not a quick fix, and the best choice is to replace the entire unit. Using a hairdryer on a regular basis is a great way to remove condensation build up from your windows. It is especially efficient in areas with high levels of humidity and condensation. Adding a dehumidifier to your home is a great way to help prevent moisture build up and keep your home free of drafts.

2. Poor Ventilation

Condensation can develop on double-glazed windows due to a variety of reasons. If you spot condensation on the outside of your window, it is generally a good sign as it suggests that your windows are functioning well and keeping cold air out and warm air in.

If the condensation is inside your window, it could be a sign of an issue. The condensation in your windows indicates that the seals have been damaged and moisture can enter between the glass panes.

The reason for this is usually poor air circulation in the room. With no flow of air, the warmth in your home is held in and this can cause moisture to build up. This is especially common in kitchens and bathrooms where there is lots of moisture and humidity in the air. If you have a double-glazed windows that is hazy, it's vital to inspect the ventilation and decrease the amount of humidity in the area to prevent condensation from forming.

Double glazing seals that are not functioning properly could also result in higher the cost of energy. It is because the heating system will have to work harder to keep your home warm. This can add up. In addition, leaking double glazing can allow cold air to enter your home, making it feel colder.

Make sure to check your double-glazed windows frequently to make sure the seals are still in place. If you regularly clean your windows with a non-chemical cleaning agent and don't let them get wet the seals are likely to last for a long time.

If you notice that a mist is forming on the double-glazed unit it may be time to replace it. The good part is that if you follow the correct steps, you can replace your existing double glazing for a fraction of the cost of a brand new window. This is not always the best option when the frame of your window is not able to accommodate the double-glazed unit. In this case, you will need to install a brand new window.

3. Faulty Installation

If you've recently installed double glazing and it is beginning to leak, it could be because of a poor installation. To ensure that your windows comply with UK building regulations, it is essential to use a FENSA-regulated installer. Faulty installation can cause the seals on the window panes to crack, allowing moisture to get in between. This will eventually cause the internal aluminium spacer bars to corrode, resulting in the sealant within the unit failing. The anti-moisture grains within the spacer bar will also become saturated with water and stop functioning efficiently.

The presence of condensation on the side facing the room of your double-glazed units suggests that there is a ventilation issue in that particular space or home that requires being addressed. It could be a mix of both and it's not unusual for double glazing to show some condensation on the outside, particularly if you are using a sealed unit with high-quality Argon fill. However, it will disappear as the glass gets warmer and air temperatures increase.

On the other side, if you notice condensation between the window panes, then there is a flaw in the window and it must be replaced. Double-glazed windows that are not functioning properly aren't insulating your home as well as they should. This can lead to increased energy costs and may cause damage to the frame of the window.

It can be frustrating to need to replace your double glazed windows, but this is a matter that must be dealt with when you notice the signs of sealant failing. It is recommended to carry the replacement out in the summer months before winter arrives, so that you can benefit from the improved thermal efficiency of your double-glazed windows.

Double-glazed windows are expected to last between 10 and 35 years. However, a number of causes can cause them to break earlier than this. Faulty seals let moisture into the window, which can cause it to fog or mist up. This could be caused by a variety of things like:

4. Age

Double glazed units are a reliable and airtight way of insulate your home while preventing condensation. The main reason is the gap that is created between the two panes. The gap is sealed using dehydrated gas or air under vacuum and protected by secondary and primary seals. This significantly reduces heat loss and keeps the inside of your home warmer while reducing energy bills.

As time passes, due to normal wear and tear, the seals on your double glazing can weaken allowing moisture to enter the space between the windows. This can result from different weather conditions. For example, when temperatures change as they do, the gasses inside the units expand and contract. Over time this causes the seals to break down, allowing moisture into the cavity.

Misted windows can have a negative impact on the aesthetics of your home however, they also decrease visibility. If left unchecked they can result in the development of mildew and mould. This could be harmful for your health and cause damage to the frame of your window.

If  misted glass replacement  finding that your double glazed windows are becoming more cloudy or misty, it's time to have them replaced. A window that is damaged is not just unsightly, but it also allows cold to penetrate your home and dramatically increase your energy bills.

Double glazing that is older does not provide adequate insulation as do modern double glazing. This means they let in more noise, which can affect your quality of living especially when you live near a busy highway or railway line. Double-glazed windows are designed to keep noise out while keeping the heat in, helping to increase your home's comfort and overall wellbeing.


Misted windows are a common problem and can be easily solved by a professional double glazing company. Make sure that your window is covered by an assurance before you have it repaired or replaced. In the case of the severity of the damage, you might only require replacing the glass unit.