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Is It Time For A Blown Double Glazing Repair? Condensation is a sign of blown double glazing. It happens when the seal between two panes has broken and allows inert gases to escape. Repairing your double-glazed windows is essential. Not only will it save money on your heating bill and cut down on outside noise but also will restore the insulating properties of the window. Seals that have been damaged The window seals in double-glazed systems create a barrier that is airtight and watertight. This helps keep