Restoring clear views to blown double glazing
When a double-glazed window becomes blown, the perimeter seal around the unit has broken down, allowing moist air to enter the gap between the glass panes. DSN Glazing provides targeted replacement services that focus on removing only the compromised glass unit while keeping your existing frames intact. Swapping out the blown unit restores complete optical clarity, eliminating persistent condensation streaks, water spots, and internal fogging for good.
Stopping heat loss from failed sealed units
A blown window is a key contributor to domestic heat loss, as the breakdown of the perimeter seal allows insulating air or gas to escape. Replacing the damaged glass unit reinstates the thermal efficiency of your double glazing, helping keep your home warmer during colder months and reducing energy expenditure. By maintaining your current uPVC, timber, or aluminium surrounds, you achieve the full insulating performance of new glazing without incurring the expense of structural frame replacements.
Precision measurements for all window types
Every blown unit is carefully measured to ensure your new double-glazed glass panel fits perfectly within your original window casing. Whether your windows feature standard clear float glass, toughened safety panes, leaded detailing, or obscured privacy designs, replacement units are manufactured to match the original unit specifications. We also apply this exact custom-measuring process when providing patio door glass replacement or integrating pet doors through our specialist cat flap installation service. This precise approach guarantees a clean installation, seamless visual match, and long-lasting durability.
FAQs
What does a blown window look like?
A blown window appears continuously foggy, misty, or dirty on the inside, with condensation trapped between the glass panes that cannot be wiped away.
Do I need to replace the entire window frame if it is blown?
No. We simply remove the blown double glazed unit and fit a new factory-sealed glass panel directly into your existing frame.
What happens when you replace a blown unit?
We visit to check the window and take accurate measurements, then provide a free quote. Once you’re happy, we arrange a convenient date to fit your new sealed unit into your existing frame.