Double glazed windows are made up of two sealed panes of glass with an insulating void between them. This void is either filled with dry air or a heavy inert gas, such as argon. Together, the two panes of glass and the void between them prevent heat loss through your windows. Over time, the effectiveness of the double glazing unit can wane, especially if the seal around one of the panes of glass loses its integrity and allows moisture-laden air to seep into the insulating void. The most common sign of a failed window seal is condensation between the two panes of glass.
Why Do Double Glazed Window Seals Fail?
Window seal failure commonly occurs in aging windows and windows that are subject to continuous changes in temperature. Faulty window installations and poor window production methods can also cause window seal failure.