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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. Signs that your double-glazed window requires repair are an odor of draught, or condensation between the windowspanes. The seal that keeps the glass panes in place has usually broken. This can be repaired with an encapsulation. Seals The seals used in double glazing are an important component of the overall insulation and energy efficiency of windows. Located between the glass panes an