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Tips 1 July 2026

Why Do Double Glazed Windows Get Misty? And How to Fix It

Why Do Double Glazed Windows Get Misty? And How to Fix It

Why Do Double Glazed Windows Get Misty?

Misty double glazing is one of the most common problems for Maidenhead homeowners. You look out of your window one morning and notice condensation trapped between the two panes of glass — the seal has failed.

What causes it?

Every double glazed sealed unit contains two panes of glass separated by a spacer bar, with the air gap filled with argon gas for insulation. The perimeter is sealed to keep moisture out. Over time — through age, temperature cycling, or minor frame movement — that perimeter seal can break down. Once it fails, moisture-laden air gets in and condenses on the inside of the glass.

Do I need a whole new window?

No. The beauty of a failed sealed unit is that you only need to replace the glass, not the frame. Maidenhead Glazing Services measures, supplies and fits a brand new sealed unit with low-E glass, warm edge spacer bars and argon gas — all building regs compliant.

The benefits of replacement

  • Clear, condensation-free glass
  • Improved thermal efficiency
  • Lower energy bills
  • Full guarantee on the new unit

Call 01628 303060 to book a misted unit replacement today.

Need help with your glazing?

Call us for a free, no-obligation quote today.

01628 303060