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How to Spot Blown Double Glazing Repairs No matter how new your double glazing is it's not indestructible. It can fail and you must have it repaired immediately if it fails. Double-glazed windows that fog are a sign of failure. It means that the seal between the two panes has failed, which results in windows that are not as effective in insulating. Seals that are damaged When a window seal is damaged, moisture may get in between two glass panes and cause fogging or condensation. This affects how windows