How to Repair a Double Glazed Window
Double glazing is a cost efficient method to increase the insulation of your home and increase its energy efficiency. It could cause problems like condensation and draughts.
Repairs are often more cost-effective than replacement. Let's take a look at the most commonly used double-glazed window repair options:
Broken Panes

The first step is to take off the broken pane. Wear a pair of thick gloves and place an empty cardboard box in the vicinity to catch any glass fragments that fall during your work. Wear a protective eye mask and mask because of the risk of lead being in the frame. Use a utility blade to cut the glazing surrounding the window pane that is broken. If clips or nails are holding the windowpane in the frame, you can use pliers to pull them out. Scrape away any old putty or glazing points after the glass is removed. A heat gun may help in softering the putty if you need to.
Once the old putty has been removed, re-grout the grooves and apply the new silicone caulk using a silicone gun. Before applying the final caulk, it's a great idea to test fit the new window into its frame. Check that the grooves in the frame are free of paint, rust, or gunk, and are not too narrow to accommodate the window.
Next you should replace the sash with the same wood molding as the windowframe. If the windowframe has deteriorated, it is easier and more cost-effective to replace the entire unit than only a single pane.
In the past, double pane windows comprised two pieces of glass, separated by a spacer. They were then filled with air or an gas for insulation. However, in recent years manufacturers have shifted to glass units that are insulated (IGs) that are more energy efficient and resistant to seal failure. In a double-pane windows with a failing IG water from the environmental air gets into the window and condenses on the inside of the glass. This process eventually destroys the insulating properties that are present in the IG and leaves an unclean remnant on the glass.
A glass repair expert can either replace the entire IG or only the damaged surface. This procedure can be costly and time-consuming, however it is the only option for fixing a defective seal that allows water to leak into the home. Installing high-quality windows by a professional who has the experience and purchasing windows from a reputable manufacturer can help avoid the possibility of future seal issues.
Misty Panes
The frame of the window holds two or three panes, separated by air-filled spaces. The air, often filled with argon gas to ensure better energy efficiency, helps to keep warm air inside and cold air out. However, in some cases, these windows begin to crack, and you will see a hazy cloud growing between the panes of the glass. It may seem like it's time for a new window, but it's not possible to simply replace the broken one.
A misted window is usually an indication that the seal between two glass panes has failed. The mist or condensation indicates that moisture has entered and damaged the insulation of the double glazing. It is essential to maintain your windows and to keep them clean.
Condensation in the panes of your windows is a sign that there's a lot of humidity in your home It's therefore essential to dehumidify the area and take other measures to increase ventilation in the rooms where this happens often. However, if the condensation is just on one side of the window, or is visible between the glass panes It's a sign that there's an issue with the seal, and you'll need to fix it.
There is no such thing as resealing a double-glazed window to restore its original energy-efficiency. When the seal fails the gap can allow cold air to enter your home, and warm air to escape. This can damage your home's insulating ability which will make it more expensive to heat.
Some businesses offer a service where they drill holes in the outer pane of your window and drain out the condensation, but this is only a short-term solution that is unlikely to last more than six months. It's not recommended you attempt to do this yourself, since it can be very dangerous without the proper tools and knowledge. A double-glazing expert will use specialist equipment to safely eliminate the condensation and install air vents to help prevent any future misting.
Frame Damage
Double glazing isn't impervious to damage and even with the best of care problems can arise. Some faults are minor and can easily be repaired. Other issues are more severe and require a complete replacement. This is a choice that should be taken by the owner of the property, taking into account the level of benefits they will receive from double glazing and how much value it can bring to their home.
If you're having difficulty opening or closing your windows it could be caused by misting on the glass or a problem with the frame. Repair your windows as soon as possible to prevent further damage to the double glazing.
As time passes, the plastic that holds the glass sheets in their frames and prevents them from moving could wear out. This can cause one or both of the glass sheets to move a bit and break the seal, which can cause misting. Mist can also form within the insulating gap between the panes which indicates that the seal has been damaged and it is now time to repair double glazing.
Another issue that is common is that windows are beginning to shrink over time which makes it difficult to open and close them. This can be fixed by adjusting the mechanisms and hinges. It is important to note that a lot of new double glazed windows come with a guarantee and in this situation it's an ideal idea to call the company from which you purchased your double glazing for information on what to do next.
Repairing double-glazed windows is possible yourself, but it's better to consult with a professional to benefit from their expertise and experience. Professionals are able to identify the issue quickly and efficiently, and then make the required repairs to your double glazing. This will help you keep your warranty intact, because attempting to fix the windows yourself without proper information could invalidate the warranty.
Weather Damage
While you might think of double pane windows as resistant to weather damage however, if you live an area prone to hail storms, ice storms high winds, and torrential rains windows and seals could take some serious damage. It is essential to inspect your windows frequently and repair any small scratches or chips when they are discovered.
Blown windows are one of the more serious issues that you might encounter when you have double glazing. They happen when a gap opens between the two glass panes which causes air and moisture to get into your home. This is usually an indication of damage to the seals or a problem with the insulating material between the panes.
Another issue that homeowners encounter with double-glazed windows is condensation that forms between the panes. This is due to the warm air in your house being warmer than the cooler air outside. The warmer air expands due the difference in temperature which could cause window seals weaken or break over time.
Double-glazed windows can cause foggy windows. This is a common problem that can be fixed without replacing the IGU. This is usually a sign that the seals between the window's panes require resealing.
To do upvc window repair , you'll have to make a hole in between the windowspanes. It should be big enough to allow for the installation of a long pipe cleaner or other long object with cloth at the end of it. The cloth end will be used to wipe your windows clean and eliminate any condensate that is left. This will help create a tighter seal and prevent the possibility of fogging in the future.
It's important to keep in mind that this is an interim solution to your windows that are foggy. When it rains or there is a sudden increase in humidity, the condensation will return. If you're seeking a permanent solution, you will have to replace the old IGU.