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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 occurs when the seal between two panes has broken, allowing inert gases to escape. Repairing your double-glazed windows is a must. It will not just save you money and reduce noise from outside however, it will also restore the insulation properties of the window. Seals that have been damaged The window seals on double-glazed units create an airtight, watertight wall that keeps heat in and cold