Have you noticed that your double glazing has become misted, with condensation in between the panes that is impossible to get to and looks unsightly?

At first, it is easy to believe that the condensation is outside the window, but when you go to wipe it off, you find you can’t! Don’t worry; misted double glazing is a common problem for people all over the world, not just here in Canada.

Why are my double glazed windows misting up?

Double glazing is so effective as it is two layers of glass with air in between that stops heat being transferred through one pane to another. They also create a sound barrier and will reduce the level of noise coming inside from outside. When your double glazing starts to mist, it is a sign that water has entered into the air gap between the two panes. This water then creates condensation that mists up your panes and causes the windows to look unsightly.

If your double glazing is misting up on the outside of the window, then there is no issue to worry about. This condensation is the result of changes in temperatures from the day to the night-time and can be easily wiped away or left to disappear on its own. Interestingly, this type of condensation is common with new double glazing as they are typically at the height of their efficiency, meaning that the temperature differences will be more evident inside and outside the house. If your glazing is misting on the outside, then do not panic! This is not a fault and is harmless to your windows.

What causes my double glazing to mist in-between panes?

Window misting is caused by a damaged or defective seal that has let water enter the cavity between the panes. This damage can be caused by a wide range of issues that include being damaged on installation, pressure on the seals that have caused them to give, drainage problems, or even a faulty seal being installed by the manufacturer.

Finding out what caused the damage is pretty tricky, meaning that you will need to arrange the replacement or repair. It is advisable to organise the work as soon as is practicable so that it doesn’t get worse.

Can misted double glazing be repaired?

If you are hoping to get your window repaired, then this may be possible, but you will need to prepare yourself for the reality that it may require replacement to work correctly again.

Warranty – Initially, we would advise that you check your installation paperwork as the window may be under warranty. If it is, then it is wise to make a claim for it to be replaced due to it being defective. Many installers will offer warranties that last many years, so it is well worth digging out your installation paperwork to check!

If your windows are not under warranty then you have two options – you can choose to try a repair, or you can opt to have the window replaced. There are pros and cons to each option, and available finances will tend to dictate your course of action.

Repairing – Repairing involves drilling a hole into the area between the two panes, removing any water inside and then installing a desiccant that will absorb any future water that enters the cavity. When this is done, the unit is resealed and reinstalled. This method does not always work, and you may need to have it repeated in the future if any further leaks appear.