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Brian M. Jamerson
Brian M. Jamerson
Content Specialist

Repair Blown Double Glazed Windows: A Guide for Homeowners

Expert solutions for repair blown double glazed windows. Restore the clarity and efficiency of your windows with our professional, cost-effective services.
Repair Blown Double Glazed Windows

Table of Contents

Your home needs repair blown double glazed windows are an essential part of your home’s energy efficiency, safety, and overall curb appeal. One common issue that homeowners may come across is blown double glazed windows. But what exactly does it mean when a window is “blown,” and how can you address this problem effectively?

When we describe a window as “blown,” we are indicating that the double glass unit has lost its seal. This results in the infiltration of air or moisture through the cracks in the glass. Consequently, several issues may arise, such as decreased insulation, higher energy consumption, condensation accumulation, and potential damage to the window frame.

To fix this problem, you need to get in touch with professional window repair experts. They can evaluate the damage and suggest the best course of action, which may include fixing or replacing the damaged window unit. If you act fast, you can get your double-glazed windows up and running again, making your home more comfortable and more functional.

Remember, addressing blown double glazed windows not only helps in maintaining a pleasant indoor environment but also protects your investment in your property in the long run.

Understanding Blown Double Glazed Windows

Understanding Blown Double Glazed Windows

Double glazed windows are also called insulated glass units. One of the most common types of windows is the double glazed windows. Double glazed windows have two panes that are separated by an opening. These panes are usually filled with a gas, such as argon or krypton. This gas acts as an additional barrier, reducing heat transfer and enhancing energy efficiency.

Over time, double glazed windows can sometimes have this issue called “blown” windows. It happens when the seal holding the two panes together starts to deteriorate, causing the inert gas to escape and moisture to get in. The result is the formation of condensation inside the unit, obstructing views and compromising the window’s thermal performance.

The presence of condensation not only affects the aesthetic appeal of the window but also indicates a decrease in its insulating ability. In addition, the obstruction of views can be frustrating for homeowners who value clarity and natural light in their living spaces.

The best way to fix this problem is to get your blown double glass windows repaired or replaced as soon as possible. By doing so, you can restore the window’s functionality, eliminate condensation, and regain the benefits of enhanced insulation and thermal efficiency.

Causes of Blown Double Glazed Windows

Several factors could lead to a double glazed window becoming blown, affecting its effectiveness and durability:

  • Age: Over time, the seal of a double glazed window naturally deteriorates due to constant exposure to various elements. The wear and tear gradually reduces its ability to insulate and prevent condensation effectively.
  • Physical Damage: Impact or pressure, such as accidental knocks or excessive force, can disrupt the integrity of the seal. Even a tiny crack or break can compromise the window’s insulation properties.
  • Manufacturing Flaws: Occasionally, issues with the manufacturing process can result in a weakened seal. Imperfections or inconsistencies during the assembly of the double glazed window may create vulnerabilities that eventually lead to a blown seal.
  • Climate and Weather: Extreme temperature changes can be harsh on the seal of a double glazed window. When it’s scorching hot or cold out, the seal expands and contracts, which can cause cracks or gaps.

This information helps identify the reasons for blown double glass windows and highlights the importance of proper upkeep and care to prolong the life of the window.

Identifying Blown Double Glazed Windows

Identifying Blown Double Glazed Windows

Spotting a blown double glazed window is only sometimes straightforward. Here are some telltale signs to look out for:

  • Condensation: If you notice moisture trapped between the two panes that can’t be wiped away on either side, you might have a blown double glass window. It happens when the sealing between the two panes breaks, allowing moisture to seep in and get stuck.
  • Drafts: Despite closing the window, if you still feel a breeze or notice air movement around it, it may indicate compromised insulation. A blown double glazed window can create gaps or cracks in the seal, allowing drafts to enter your home.
  • Distorted Views: If you frequently notice a smearing or distortion on the glass, it could be a sign of a blown double glazed window. When the seal fails, it can cause the glass to shift or sag, resulting in an altered view.

By paying attention to these signs, you can identify potential issues with your double glazed windows and take necessary steps for repair or replacement.

Repair Blown Double Glazed Windows

Repairing Blown Double Glazed Window

When it comes to repairs, you have a few choices:

DIY Options for Small Repairs

  • Desiccant Silica Gel: Silica gel desiccant packs work wonders at soaking up moisture. Stick them in window frames to tackle condensation and reduce the humidity in the air. Bid farewell to mold and mildew, and welcome a home that is dry and cozy!

Professional Help

  • Re-Sealing: If you notice a blown window, don’t worry! Professionals can often reseal it, restoring its integrity and preventing further damage. Expertly sealing the window ensures that it remains watertight and energy-efficient, providing you with long-lasting comfort and peace of mind.
  • Replacement: While resealing is a viable option in many cases, there are situations where the only solution is to replace the window unit entirely. This comprehensive approach guarantees optimal performance and durability, as the new window unit is specifically designed to meet modern standards. Although it may involve a higher initial cost, window replacement offers a long-term solution that enhances both the aesthetics and functionality of your space.

Cost Considerations

How much does it cost to fix a blown double glazed window? The answer depends on several factors, including the type of damage, the size of the window, and whether a total replacement is required. Factors such as the size of the window and the location of the property may also impact the cost. Request multiple quotes from different vendors to ensure you get a fair and reasonable price that fits your needs. Comparing prices and looking at other options will help you make the best choice and get the most out of your investment.

Preventing Blown Double Glazed Windows

Preventing Blown Double Glazed Windows

Maintenance Tips

  • The window frames need to be cleaned and maintained in order to maintain the seal. Regularly cleaning the frames helps prevent dirt and debris from accumulating, which can compromise the effectiveness of the seal.
  • To keep those window seals clean, it’s essential to regularly check the frames for any signs of wear and tear. Give those frames an excellent once-over to spot any cracks, chips, or damage that might weaken the window seal. By identifying and repairing these problems early, you can ensure that the window seal remains in good condition for an extended period.
  • Furthermore, ensuring that windows are correctly installed is critical to maintaining a solid and effective seal. It is essential to check that the windows are installed without any gaps or misalignments that may strain the seal. Proper installation guarantees a tight fit, minimizing the risk of air or water leakage.

If you follow these steps and keep an eye on these details, your window seals will stay in good condition and last longer.

Best Practices

  • Blinds, curtains, and other window coverings can also be used to reduce the amount of direct sunlight that hits your furniture, keeping your home cooler and more comfortable.
  • Ensure proper ventilation in rooms to prevent the buildup of excessive humidity levels, which can compromise the integrity of seals on doors and windows, leading to potential issues such as condensation or mold growth. Good ventilation will help maintain a healthy and pleasant indoor environment.


Recognizing and rectifying the problem of a blown double glazed window is essential for the comfort and energy efficiency of your home. While some minor fixes can be DIY projects, seeking professional advice is often the best route to ensure longevity and performance. Don’t let a blown window go unaddressed—act swiftly to restore your home’s insulation and aesthetics.

Encourage your double glazed windows to live their entire lifespan through attentive care and quick responses to any sign of failure. Remember, taking care of your windows is not just about maintaining a clear view outside—it’s about investing in your property’s value and comfort.

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