What Are Blown Windows?

If you’ve noticed a misty or foggy appearance inside your double-glazed windows, chances are you’re dealing with “blown windows.” This is a common issue where the seal between the two panes of glass in a double-glazed unit has failed, allowing moisture to seep inside.

The seal is designed to keep air and moisture out while maintaining an insulating layer of gas between the panes, usually argon, which improves thermal efficiency. Once this seal breaks, the insulating gas escapes, and moisture begins to form between the glass layers.

Why Do Blown Windows Happen?

There are several reasons why window seals fail, leading to blown windows:

• Age of the Windows: Over time, the seal naturally wears out due to constant exposure to the elements.
• Temperature Changes: Repeated cycles of heating and cooling cause the materials around the window to expand and contract, weakening the seal over time.
• Poor Installation: Incorrect installation or low-quality seals can lead to premature failure.
• Environmental Exposure: Direct sunlight, high humidity, and extreme weather conditions can degrade the window seals faster.

Blown windows are particularly common in older properties or homes with windows that haven’t been maintained properly. While it might seem like a minor issue at first, it can lead to larger problems if ignored.

How Can You Spot a Blown Window?

The signs of blown windows are usually easy to identify. The most noticeable sign of a compromised double glazed unit is condensation or mist forming between the panes of glass.

You might also see water droplets or a general foggy appearance that won’t go away no matter how much you clean the outside of the window. If you feel a draught near the window or notice a general decrease in your home’s ability to maintain a comfortable temperature, that could also be a sign of failed double glazing where the insulating properties have been compromised.

 

The Impact of Blown Windows on Your Home

While blown windows might seem like a purely cosmetic issue, they can have a more significant impact on your home’s comfort and energy efficiency.

Reduced Energy Efficiency

Double-glazed windows are designed to keep your home warm in winter and cool in summer by providing an extra layer of insulation. When the seal breaks, this insulating barrier is lost, making it easier for heat to escape in cold weather or enter during hot weather. As a result, your heating and cooling systems have to work harder, leading to higher energy bills.

Condensation and Damp

When moisture gets trapped between the panes, it can eventually lead to dampness around the window frames. Over time, this can cause mould growth and potentially damage the structure of your home.

Aesthetic Issues

A foggy window simply doesn’t look good. It can detract from the overall appearance of your home, especially if multiple windows have been affected. For homeowners looking to sell their property, blown windows can be a turn-off for potential buyers who may be wary of the costs involved in repairing them.

 

Repairing Blown Windows: What Are Your Options?

The good news is that if you have blown windows, it doesn’t necessarily mean you need to replace the entire window unit. In most cases, it’s possible to repair the problem by replacing just the sealed unit, which is the two panes of glass and the space in between. This is a much more cost-effective solution than replacing the entire window frame.

How the Repair Works

A professional window fitter will carefully remove the failed sealed unit and replace it with a new one that includes fresh insulating gas and a fully intact seal. The process is relatively quick and can usually be completed within a day, depending on how many windows need attention.

Unfortunately, it is not possible to fix a blown window properly without replacing the glass, but we can prevent the cost of replacing the whole window in most cases.

In some cases, particularly with older or poorly installed windows, you may decide it’s better to replace the entire window unit, especially if the frames are in poor condition. A full replacement will ensure that both the frame and the glass are performing optimally in terms of energy efficiency and security.

 

How To Prevent Blown Windows

While it’s impossible to guarantee that your double glazed window pane won’t eventually fail, there are a few steps you can take to reduce the likelihood of blown windows in the future:

• Regular Maintenance: Ensure that your windows are properly maintained by cleaning them regularly and checking the seals for signs of wear and tear.
• Professional Installation: If you’re installing new windows, make sure you use a reputable company to avoid poor installation, which is a common cause of early seal failure.
• Choose High-Quality Materials: Opt for glass panes and replacement windows with high-quality materials and robust seals, which will last longer and provide better protection against the elements.

 

How Totalseal Can Help

At Totalseal Repairs, we specialise in blown double glazing and misted window repair for homes across Central Scotland. Our team of expert window fitters can assess the condition of your windows, identify the issue, and recommend the most cost-effective solution. We offer a comprehensive service, from replacing just the sealed glazing unit to full window replacements if necessary.

Our goal is to restore your windows to their original clarity and performance, ensuring your home stays warm, comfortable, and energy-efficient. We pride ourselves on providing a professional, hassle-free service that gets your windows back in top condition with minimal disruption to your day.

If you’ve noticed misting or condensation between the panes of your windows, or are wondering how does double glazing work, don’t wait until the problem gets worse. Contact us today for a free, no-obligation repair or replacement survey. We’ll assess your windows and provide a tailored quote to get them back in perfect working order. With Total Seal Repairs, you can trust that your home will be in good hands, and your windows will once again be clear, efficient, and secure.

Blown windows are a common issue that can lead to decreased energy efficiency and damp problems if left untreated. Luckily, the solution is straightforward and cost-effective and replacing the sealed glass unit can often restore your window to its former glory. At Totalseal Repairs, we’re here to help. Reach out to us today for expert advice and top-quality service that will have your windows looking and performing like new in no time.