Why condensation forms Between a failed
Double-glazing Unit
When condensation between double pane windows forms it means the seal on
the insulated glass unit has failed. In this situation, why replace the unit when you
can fix it?
How Insulated Glass Works
With double pane windows, the insulating airspace in between the glass
panels reduces heat loss. Most modern windows have two panes of glass an inner
seal to protect against moisture and corrosion, and an outer seal to protect the
strength of the window. The seals hold a spacer in place
Why Do Seals Break?
For the most part insulated glass windows work extremely well. They can
withstand and handle all types of weather, including cold temperatures, heat, and
humidity, as well as repetitive open and close motions. With the double seal,
when one seal begins to break, the other can hold the line for a while. However,
as the window ages its components begin to break down, and the standard
lifespan of double pane windows ranges from 10 to 20 years.
Other than old age, there are two additional factors that affect seal breakage:
ï‚· Water retention in the frame or improper drainage around the window.
 Direct exposure to sunlight—the more sun your window gets, the more heat
will build up causing the panes to expand, contract and eventually weaken.
Once the seal is broken, moisture begins to form between the panes, giving your
windows a milky, foggy look.
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