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How to Repair Double Glazed Windows

Typically double glazing comes with a guarantee of either 10 or 20 years. If your double-glazed windows show signs of aging, you could be eligible to be repaired under warranty.

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

Damaged Glass

A seal that is airtight is vital for double pane windows to work effectively. Condensation between the glass plates is a common sign of a faulty seal. While condensation between glass is not an issue that is serious and can be fixed, it's typically an indication that the glass unit requires replacement. If you have an older double glazed window, this may require replacing both the frame and the glass. If the frame is in good condition however, you can usually save money by replacing only the glazing.

Glass is brittle and it's not uncommon for double-pane windows that develop cracks as time passes. If the cracks weren't caused by mechanical damage or an unusual impact on the window they can be fixed by using epoxy and elbow grease. Begin by cleaning over the cracked area with a wet cotton rag and then apply epoxy to the crack following the manufacturer's instructions. Allow the epoxy to fully dry before applying paint and sanding to the repaired area.

It's also possible to keep a crack from spreading with a simple strip of masking tape. A single strip of masking tape applied to both sides of the crack ought to suffice to stop cracks that appear superficial from spreading, such as stress-cracks caused by low temperatures. However, if you're dealing more serious cracks that have already developed in your glass, it may be advisable to consult an expert to ensure the safety of the repair.

It is risky 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 with inert gas, which means it's impossible to remove the glass without causing damage to the entire window. If you plan to replace the glass in your double-paned windows pick a manufacturer with an extensive warranty.

You can also apply newspaper to protect the window frame before you remove the sash, or replace any broken glass. This will shield you from any sharp shards of glass that may fall on the way and also help to protect the trim of your home or molding.

Condensation Build-Up

The good part is that condensation occurring between window panes is normal. This is due to a difference between the temperatures and humidity of the air. The water vapour in air condenses when it comes in contact with cold, impenetrable surfaces such as windows. Usually this is beneficial, especially during winter because it helps to prevent heat loss.

If your windows appear like they are cloudy and have a thin layer of water on them, you must call an experienced professional glazier. This indicates that the seal between the two panes is beginning to weaken and allows moisture to enter the window.

You can stop this by making use of dehumidifiers, increasing ventilation, or by applying de-icing agents. There are also specialists who can fix condensation build-up in double-glazed windows by drilling holes into the window unit and pumping or injecting a specific desiccant to remove the excess moisture. This is a more complex process that requires the sealed unit to be removed from the frame, and then opening each glass pane, cleaning them thoroughly and then filling them with desiccant prior to sealing them up. This is typically an expensive option, but it's important to make sure the company you choose is licensed and insured with FENSA.

It is crucial to remember that tampering with your double-glazed windows is not recommended and could invalidate any guarantees. If you have a warranty on your windows, it's best to let the company know of any issues that arise as it will be accountable for the replacement of units covered that are covered under warranty. Also, any damage incurred by tampering is likely not be covered under your guarantee either so it is recommended to seek out expert advice prior to trying any DIY repairs. This is especially true for older units as they can sometimes be more susceptible to fail. It is recommended to replace the entire glazed panel in the event of this. You'll then have brand new windows that will last for many years.

Scratches

Double glazed windows are not impervious to scratches. This could be the result of environmental conditions or can even be caused by the manner in which the window was initially installed.

Many of these scratches are superficial, and can be easily fixed with some home solutions. If you feel scratches on your windows using your fingernail, or if they are deep, it's best to consult a professional to restore the glass to its original condition.

Superficial scratches are caused by objects scraping against the glass the windows' surface such as tree branches, pet claws and abrasive materials used when cleaning. Often, these scratches can be removed with certain non-abrasive products like iron oxide polishes or cerium oxide, but you'll need to continue using until the scratch is gone.

Scratches can also be caused by sanding wood trim on your windows. They can also occur during construction work. These can be difficult to repair, however a small amount of baking soda mixed with water can help smooth the area that has been buffed and remove any scratches that remain.

Metal polish can be used to get rid of deeper scratches. Apply a small amount the product to a cotton ball or clean microfibre cloth and gently rub the affected area in a circular motion. Be careful not to apply too much pressure, as this can cause further damage to the glass. Once the surface is smooth, use a moist cloth to remove any remaining polish.