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Is It Time For A Blown Double Glazing Repair? Condensation can be an indication that your double glazing has blown. It happens when the seal between two panes has broken and allows inert gases to escape. Having your double glazed windows repaired is crucial. It will not only save you money and reduce the noise outside, but it will also improve the insulating qualities of the window. Damaged Seals The window seals of a double-glazed system are responsible for creating an airtight barrier and watertight.