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Is It Time For A Blown Double Glazing Repair? Condensation is a sign of double glazing that has been blown. This is when the seal between two glass panes has cracked, allowing the inert gas to escape. Repairing your double-glazed windows is a must. Not only will it help you save money on your heating bill and reduce outside noise, it will also restore the insulation properties of the window. Seals that have been damaged The window seals on double-glazed units are responsible for forming an airtight, watert