Mon. Jul 15th, 2024

How to Repair Double Glazed Windows

Typically double glazing comes with a warranty of either 10 or 20 years. So, if your double-glazed windows are showing signs of aging you may be eligible to have them repaired under warranty.

Double-glazed window repairs require replacing the existing glass unit. The seal isn’t working properly when you notice mist.

Glass that is damaged

Double pane windows require an airtight seal in order to function effectively. The most frequent sign that a seal may be failing is condensation forming between the glass plates. Condensation between glass plates are not a major problem and can be resolved however, it’s an indication that your glazing unit is in need of replacement. If you have an older double-glazed window, this could require replacing both the glass and the frame. If your frame is in good condition, however, you can typically save money by replacing only the glass.

Glass is brittle and it’s not uncommon for double-pane windows to develop cracks as time passes. If the cracks aren’t caused by mechanical damage or an unusual impact on the window they can be fixed with epoxy and some elbow grease. Begin by cleaning over the cracked area with a damp cotton rag. Next, apply epoxy to the crack following the manufacturer’s instructions. Allow the epoxy to completely dry before sanding and painting the repaired area.

A simple strip of masking tape can be used to keep cracks from spreading. One strip of tape placed on both sides of the cracked area should be enough to prevent superficial cracks, like stress cracks caused by low temperatures, from worsening. If you notice more severe cracks in your glass that are already present, it’s best to contact a professional for the repair.

It is dangerous and difficult to replace a single pane within double-paned windows. Double-pane windows are constructed as a complete unit and sealed in the factory using inert gas, which means it is impossible to remove the glass without causing damage to the entire window. If you intend to replace the glass in your double-paned windows, select a brand that has a strong warranty.

It’s also a good idea to pad the window frame with newspaper prior to when you attempt to take off the sash and replace any damaged glass. This will shield you from any sharp shards of glass that may fall on the way as well as to prevent any damage to the trim or molding of your home.

Condensation Build-Up

The good part is that condensation occurring between window panes is totally normal. It’s caused by a disparity between the temperature of air and humidity levels, which causes water vapour in the air to condense when it touches cold, hard surfaces like windows. This is usually a good thing during winter, since it helps prevent heat loss.

If your windows look like they are cloudy and have a thin layer of water on them, you must seek out a professional glazier. This is an indication that the air gap seal between two glass panes has started to degrade and allowing moisture into the window.

You can stop this from happening by making use of dehumidifiers, increasing ventilation, or using de-icing agents. There are companies that can remove excess moisture from double-glazed windows through drilling into the unit and injecting desiccant. This is a more complex procedure that requires the unit to be removed from the frame, opening up each pane of glass and thoroughly cleaning them, then filling them with desiccant and sealing them back up. This is usually more expensive however, it’s essential to check that the company you choose to work with is insured and is registered with FENSA.

Be aware that any modification to your double-glazed windows could end any warranties. If you have a guarantee on your windows, it’s recommended to let the company be aware of any issues that arise, as it will be accountable for the replacement of windows that are covered under warranty. Also, any damage caused by tampering will most likely not be covered by your warranty, so it’s better to seek expert advice before trying any DIY repair. This is particularly the case for older units as they are sometimes more prone to fail. If this happens, it’s best to replace the whole glazing panel. You’ll then have brand new windows that will last for years to come.


It’s not uncommon for double glazed windows to be impacted by scratches on their surfaces. This could be due to environmental factors, or the manner in which the window was put in place.

Thankfully, many of these scratches are superficial and can be easily repaired by a few do-it-yourself remedies. If your windows are damaged to the point where you can feel them with your finger it is best to seek out a professional for help to ensure that the glass surface is restored to its original form.

These scratches occur when objects like tree branches, pet nails, and cleaning materials that are abrasive scrape against the glass of your windows. The scratches can be removed with non-abrasive solutions like iron oxide or cerium dioxide polishes. You’ll need to use these until the scratch disappears.

Scratches can also result from sanding the wood trim next to your windows. They can also occur during construction work. They can be difficult to repair, but a small amount of baking soda mixed with water should help smooth the surface and eliminate any remaining scratches.

Metal polish can be used to eliminate deeper scratches. Add a small amount of it to cotton balls or a clean microfibre cloth and gently rub the affected area with a circular motion. Be cautious not to apply too much pressure since this could exacerbate any further damage to the glass. After the glass has been smoothed, apply a damp cloth to remove any polish residue.

Consider purchasing a non-abrasive special glass polish if you’ve got a a deep scratch you cannot seem to remove. It can be purchased at any DIY store and must be applied according to the instructions on the product packaging. Alternately, you can apply nail polish to smooth the area and cover any shallow scratches on the glass of your window. Make sure that the nail polish is clear and only applied to the scratched area of your window sash repairs.


The presence of haze in your double-paned window means that the seal between the two panes has been damaged. This needs to be fixed as soon as possible to ensure that moisture and dirt are not able to accumulate between the glass panes. This can damage the glass and decrease its transparency.

There are a variety of options to remove haze from your double pane windows. One option is to apply a spray to defog the windows. This is only a short-term solution. If you want a permanent solution, you should consult an experienced glass company. They can repair the problem or replace the gaskets if required.

A carbide-tipped instrument can be used to make tiny holes in the frame of the window to eliminate the haze. You can then put desiccate packs into these holes and wash the window with rubbing-alcohol. The water will help clear the haze off the window and wash it.

To prevent fogging, it is essential to keep your windows clean and maintained by cleaning them frequently. This will allow you to look through the double panes and enjoy the stunning view from your garden or home. Additionally, making sure that your home is well ventilated will also be beneficial. This will ensure that any condensation gets sucked away, rather than being allowed to settle and reseal the window.

In addition to regular cleaning and maintenance, you should also ensure that your windows are correctly installed. The installation of your windows must be done by a professional glazing company. This will help to ensure that the gaskets are installed properly and have an exact fit. It is a good idea to repair your windows in the shortest time possible before they begin showing signs of wearing out. This will prevent expensive double pane window repairs.

In general, double-glazed windows that have insulation are built to last for about 20 years. This is due to the fact that they are designed to withstand a variety of conditions like extremely cold temperatures, Repair Double Glazed Windows extreme heat, humidity, and repeated closing and opening. It is essential to remember that improper installation or faulty material could reduce the life span of double-glazed windows.

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