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How to Spot Blown Double Glazing Repairs No matter how new your double glazing may be, it's not impervious to damage. It's likely to fail, and you must have it repaired when it fails. Double-glazed windows that fog are a sign of failing. It is a sign that the seal between the two panes has failed, leading to windows that are not as effective in insulation. Damaged Seals When a window seal fails moisture can enter between two glass panes, causing fogging or condensation. This will impact how well windows a