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How to Repair Double Glazing Double-glazed windows last for a long time and secure, but they will wear and tear over time. Double glazing that requires repair is identified by a sensation of draught between windows or condensation. Fogging or condensation between the panes typically indicates that the seal holding the glass panes has broken down. This can be fixed by an encapsulation. Seals The seals used with double glazing are an essential component of the overall insulation and energy efficiency of wind