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How to Repair Double Glazed Windows

Double glazing is typically covered by a warranty for 10 or 20 years. If your double-glazed windows are showing signs of aging, you could be eligible to be replaced under warranty.

Double-glazed window repair requires re-sealing your existing glass unit. The seal is failing in the event that you see mist.

Damaged Glass

A seal that is airtight is essential for double pane windows to work properly. The most frequent sign that a seal is failing is the formation of condensation between the glass plates. While condensation between glass isn't an issue that is serious and can be dealt with, it's typically an indication that the glass unit needs to be replaced. If you have an older double-glazed window, this may require replacing both the glass and the frame. If the frame is in good condition however, you could generally save money by replacing just the glass.

Glass is brittle and it's not uncommon for double-pane windows that develop cracks as time passes. If the cracks aren't caused by mechanical damage or a jarring impact to the window it is possible to repair them with epoxy and some elbow grease. Begin by cleaning the crack with a wet cotton rag and then apply epoxy to the crack following the instructions of the manufacturer. Allow the epoxy to completely dry before painting and sanding the repaired area.

A simple strip of masking tape can be used to keep cracks from spreading. A single strip of masking tape applied to both sides of the crack should be sufficient to prevent superficial cracks from spreading, such as stress-cracks that are caused by low temperatures. If you're dealing more serious cracks that have already developed in your glass, it could be best to call a professional to ensure the safety of the repair.

The process of replacing one pane of double-pane window glass is a difficult and dangerous DIY task. Double-pane windows are made as a complete unit, and sealed in the factory using inert gas, which means it's impossible to remove the glass without causing damage to the entire window. If you're planning to replace the glass in your double-pane windows, ensure that you select a high-quality brand that comes with a strong warranty.

It's also recommended to cover the window frame with newspaper before you attempt to remove the sash, and then replace any broken glass. This will help protect you from any sharp shards of glass that may fall in the process as well as to prevent any damage to the trim of your home or molding.

Condensation Build-Up

The good part is that condensation occurring between window panes is normal. It's caused by a disparity between the temperature of the air and humidity levels and causes water vapour in the air to condense upon contact with cold impenetrable surfaces such as windows. Usually this is a good thing, especially in winter as it prevents loss of heat.

However, if you're noticing that your windows are appearing cloudy and have a layer of water on them, it's time to hire an expert Glazier. This is a sign that the 'air gap seal between the two panes of glass is beginning to break down and is letting moisture into the window.