Double Glazing Windows

Can You Fix Blown Double Glazing Windows? 

Double glazing has become a standard choice for homeowners seeking better insulation and energy efficiency. However, over time, issues such as blown double glazing can arise, causing concerns about repairability and costs. In this blog post, we’ll explore what blown double glazing is, common causes, repair options available, and how professionals handle this issue. By understanding these aspects, you’ll be better equipped to address blown double glazing windows effectively and maintain the comfort and efficiency of your home.

Understanding Blown Double Glazing

Double glazing consists of two glass panes separated by a spacer filled with a layer of inert gas, providing enhanced insulation compared to single-pane windows. Blown double glazing occurs when the seal between these panes fails, allowing moisture to enter the space between them. This moisture leads to condensation and fogging inside the window, reducing its thermal insulation properties and aesthetic appeal. Blown double glazing is often characterized by a cloudy or misty appearance between the glass panes, which indicates the presence of trapped moisture and possibly even mold growth in severe cases.

What Causes Blown Double Glazing? 

Several factors contribute to blown double glazing. One primary cause is the degradation of the window sealant over time, which can be accelerated by exposure to weather elements such as sunlight, rain, and fluctuating temperatures. Poor installation practices or manufacturing defects can also lead to premature seal failure. Additionally, physical damage to the window frames or glass panes, such as cracks or chips, can compromise the seal and contribute to blown double glazing.

Effects of Blown Double Glazing 

Blown double glazing not only affects the visual clarity of windows but also reduces their thermal efficiency. The presence of moisture and condensation between the glass panes indicates a breach in the insulation barrier, allowing heat to escape during winter and enter during summer. This can result in increased energy consumption as heating and cooling systems work harder to maintain desired indoor temperatures. Furthermore, condensation inside the window can lead to mold growth if left untreated, posing health risks and further compromising indoor air quality.

Repairing Blown Double Glazing 

Repairing blown double glazing typically involves addressing the failed seal between the glass panes. Professional glass repair services can assess the extent of the damage and recommend suitable solutions. In many cases, specialized techniques are used to remove the moisture trapped between the panes, clean the interior surfaces thoroughly, and replace the sealant with a new, durable seal that restores the window’s insulation properties.

For minor instances of blown double glazing, where the damage is confined and the window frames remain structurally sound, targeted repairs can effectively restore the window’s function and appearance. This approach not only resolves the immediate issue but also helps prevent further deterioration and potential health risks associated with mold growth.

In cases where the damage is extensive or the window frames themselves are compromised, replacement of the entire window unit may be necessary. Modern advancements in window technology have made replacement windows a viable option, offering improved energy efficiency, enhanced durability, and aesthetic appeal compared to older window models.

When to Consider Replacement 

While repair is often feasible for blown double glazing, there are situations where replacement becomes the more practical solution. If the window frames exhibit severe damage or if the glass panes themselves are significantly compromised, replacement ensures the structural integrity and efficiency of the window. Additionally, if the window is outdated and no longer meets current energy efficiency standards, replacing it with a newer double glazed window can provide long-term benefits in terms of energy savings and comfort.

Moreover, homeowners should consider replacement if the cost of repairs approaches or exceeds the cost of installing a new window. Investing in a modern, energy-efficient double glazed window not only enhances the aesthetic appeal of your home but also contributes to reduced energy consumption and lower utility bills over time.


In conclusion, dealing with blown double glazing requires timely attention and appropriate action to restore the efficiency and aesthetic appeal of your windows. By understanding the causes and effects of blown double glazing and knowing the repair options available, homeowners can make informed decisions to address this issue effectively.

For residents of Glasgow dealing with blown double glazing, seeking professional services specializing in double glazing in Glasgow is advisable. These experts can provide tailored solutions, whether through repair or replacement, to ensure your windows regain their optimal performance and energy efficiency. By prioritizing maintenance and addressing issues promptly, you can prolong the lifespan of your double glazed windows and enjoy a more comfortable and energy-efficient home environment for years to come.

Investing in the upkeep of your double glazed windows not only preserves their functionality but also enhances the overall sustainability of your home. With proper care and professional attention, double glazed windows can continue to provide comfort, energy efficiency, and aesthetic appeal for many years, making them a worthwhile investment in your property’s future.

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