Double glazing is designed to keep your home warm, energy-efficient and free from draughts. However, over time, you may notice condensation or mist forming between the panes of glass. This is known as “blown double glazing” and it’s a clear sign that your sealed unit has failed.
At Rydale Windows, we provide expert double glazing repairs and replacement services, helping homeowners restore clarity, efficiency, and performance to their windows and doors.
What Is Blown Double Glazing?
Blown double glazing occurs when the airtight seal between the two panes of glass breaks down. Double glazed units are filled with either air or inert gas (like argon), and this sealed gap is what provides insulation.
When the seal fails:
- Moisture can enter the gap
- Condensation or fogging appears between the panes
- The window loses its insulating properties
Why Does Double Glazing Blow?
There are several reasons why double glazing can fail over time:
1. Age and Wear
Like any building component, double glazing has a lifespan. Seals naturally degrade over time, especially in older units.
2. Temperature Changes
Repeated expansion and contraction caused by changing weather can put stress on the seal, eventually causing it to fail.
3. Poor Installation
If the window wasn’t installed correctly, the seals may be compromised from the start.
4. Frame Movement
Structural movement in the property can place pressure on the glazing unit, leading to seal failure.
5. Manufacturing Faults
In some cases, the seal may fail prematurely due to defects in the manufacturing process.
How to Spot Blown Double Glazing
Common signs include:
- Condensation or mist between the panes
- A cloudy or foggy appearance
- Water droplets trapped inside the glass
- Reduced insulation (rooms feel colder)
- Increased energy bills
If you notice these issues, it’s likely your double glazing has blown.
Can You Repair Blown Double Glazing?
In most cases, you cannot repair the sealed unit itself once it has blown. The seal has failed, and it cannot be resealed effectively.
However, the good news is that you don’t always need to replace the entire window.
How to Fix Blown Double Glazing
Option 1: Replace the Glass Unit (Most Common Solution)
The most effective and cost-efficient solution is to replace the sealed glass unit only, rather than the full frame.
This involves:
- Removing the old, failed unit
- Measuring and manufacturing a new sealed unit
- Fitting the new glass into your existing frame
This restores:
- Clarity
- Thermal efficiency
- Overall window performance
Option 2: Full Window Replacement
If your frames are old, damaged, or inefficient, it may be more cost-effective to replace the entire window, not just the glass.
This is often recommended if:
- The frames are warped or deteriorating
- The locking mechanisms are failing
- You want to upgrade to more energy-efficient windows
Can You Temporarily Fix Blown Double Glazing?
While some DIY methods suggest drilling or defogging, these are temporary fixes at best and can often cause more damage.
The only reliable, long-term solution is to replace the failed sealed unit.
Why Choose Professional Double Glazing Repairs?
Having your blown double glazing repaired by professionals ensures:
- Accurate measurements and perfect fitting
- High-quality, energy-efficient replacement units
- Proper sealing and long-term performance
- Improved comfort and reduced energy costs
Double Glazing Repairs & Replacement from Rydale Windows
Blown double glazing is a common issue, but it doesn’t always mean replacing your entire window. In many cases, a simple glass unit replacement can restore your windows to their original performance.
At Rydale Windows, we specialise in:
- Double glazing repairs
- Replacement glass units
- Full window replacements
- Energy-efficient upgrades
Whether you’re dealing with misted windows, draughts, or failing seals, our experienced team can provide a fast, reliable, and cost-effective solution.
Contact Rydale Windows today to discuss your double glazing project and discover the best solution to your situation.
Rydale Windows – Combining quality, security, and style for homes across the West Midlands.
