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Is It Time For A Blown Double Glazing Repair? Condensation could be an indication that your double glazing has been blown. This occurs when the seal between two panes is broken, allowing inert gases to escape. Repairing your double-glazed windows is an absolute must. Not only will it save money on your heating bills and reduce outside noise, but it also improves the insulation properties of the window. Seals that have been damaged The window seals on a double-glazed unit create an airtight, watertight wall