There is nothing quite like the view across the Cotswold hills or a crisp morning in the West Midlands – unless, of course, that view is blocked by a foggy, misted blown double glazing window.
If you’ve noticed water droplets or a “cloudy” appearance inside your double glazing, you aren’t alone. This is one of the most common issues we see at Cotswold Glass and Glazing. But what causes it, and do you really need to replace the whole window?
What Causes Condensation Between Glass Panes?
Double-glazed windows are made of two panes of glass separated by a “spacer bar” and sealed to create an airtight gap. This gap is usually filled with an insulating gas like Argon.
When you see moisture inside that gap, it is a sign that the hermetic seal has failed. This is often referred to as “blown” double glazing.
Internal vs. External Condensation: Know the Difference
Before you panic, check exactly where the water is:
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On the Room Side: This is usually just high humidity from cooking or showering. The Fix: Open a window or use an extractor fan.
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On the Outside: This often happens on highly efficient windows on cold mornings. It means your windows are doing their job! The Fix: It will clear as the sun comes up.
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Between the Panes: This is the “blown” unit. You cannot wipe this away, and it won’t disappear on its own.
1. Replacement Sealed Units (The Best Solution)
Many homeowners believe that misted glass means they need to buy brand-new window frames. This is a myth. At Cotswold Glass and Glazing, we can simply remove the affected glass unit and replace it with a new, energy-efficient sealed unit. You keep your original frames, the job is finished in under an hour, and it costs a fraction of the price of a full window replacement.
2. Improving Ventilation
While a broken seal needs a professional fix, you can prevent future failures by ensuring your home has adequate airflow. Using trickle vents and keeping a consistent temperature in your home reduces the “pumping” effect that stresses window seals.
3. Professional Resealing
In some very specific cases, a unit can be “demisted” by drilling small holes and adding drying agents. However, this is often a temporary fix. Replacing the glass unit is the only way to guarantee your home stays energy-efficient and draught-free.
A blown window isn’t just an eyesore. Because the insulating gas has escaped, your window is no longer keeping the heat in. This leads to:
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Higher Energy Bills: Heat escapes through the failed unit.
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Mould Growth: Moisture can eventually seep onto your window sills and walls.
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Reduced Property Value: Misted windows suggest a lack of maintenance to potential buyers.
We provide transparent, competitive pricing across Evesham, Worcester, Broadway, Chipping Campden, Moreton‑in‑Marsh, Stow‑on‑the‑Wold, and surrounding Cotswold villages.
- Free, no obligation quotes
- Honest pricing with no hidden extras
- Fully employed fitters - never subcontractors
- High quality products to suit every budget
- Local knowledge and exceptional workmanship
Get a Free Quote in the Cotswolds & West Midlands
If your windows have lost their sparkle, don’t wait for the damp to set in. Cotswold Glass and Glazing provides fast, affordable glass replacement across Evesham, Pershore, Worcester, and the wider Cotswolds.
