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How to Spot Blown s Whatever new your double glazing is it's not a guarantee of durability. It is susceptible to failure and you must have it repaired when it fails. Double-glazed windows that fog are a sign of failing. It indicates that the seal between the two glass panes has begun to leak, which means your window will no longer be as effective for insulation. Damaged Seals When a window seal fails, moisture may get between the glass panes and create fogging or condensation. This could affect the efficie