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Is It Time For A Blown Double Glazing Repair? Condensation is a sign that your double glazing has blown. This happens when the seal between two panes of glass has cracked, allowing the inert gas to escape. Double-glazed windows that are repaired is crucial. Not only will it save you money on your heating bill and cut down on 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 barri