Can You Fix Blown Double Glazing Doors? 

Double glazing has become a staple in modern homes, offering enhanced insulation and energy efficiency. However, over time, issues such as blown double glazing can occur, prompting concerns about repairability and costs. 

This blog post delves into what blown double glazing entails, its common causes, available repair options, and how professionals address this issue. By gaining insight into these aspects, homeowners can effectively manage blown double glazing windows  to maintain their home’s comfort and efficiency.

Understanding Blown Double Glazing

Double glazing refers to windows that consist of two panes of glass separated by a spacer filled with a layer of inert gas, such as argon or krypton. This construction is designed to improve insulation and reduce heat transfer between the inside and outside of a building. Blown double glazing occurs when the seal between these panes fails, allowing moisture to enter and causing condensation or fogging inside the window. This phenomenon not only detracts from the window’s aesthetic appeal but also reduces its thermal insulation properties, leading to potential energy inefficiencies.

What Causes Blown Double Glazing?

Blown double glazing can stem from various factors. Primarily, it occurs due to the deterioration of the window sealant over time, exacerbated by exposure to weather elements such as sunlight, rain, and temperature fluctuations. Poor installation practices or manufacturing defects can also contribute to premature seal failure. Additionally, physical damage like cracks or chips in the glass or window frames can compromise the seal, leading to blown double glazing.

Effects of Blown Double Glazing 

The presence of moisture and condensation between the glass panes signifies a breach in the insulation barrier of double glazed windows. This compromises their ability to retain heat during winter and block heat during summer, thereby increasing energy consumption for heating and cooling. Moreover, persistent condensation inside the window can foster mold growth, posing health risks and further diminishing 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 employ specialized techniques to remove trapped moisture, clean interior surfaces thoroughly, and replace the sealant with a new, durable seal. This process restores the window’s insulation properties and clarity.

For minor instances of blown double glazing where structural integrity remains intact, targeted repairs can effectively resolve the issue. This approach not only mitigates immediate concerns but also prevents further deterioration and associated health risks.

In cases of extensive damage or compromised window frames, complete window replacement may be necessary. Advancements in window technology offer modern double glazed windows that provide superior energy efficiency and durability compared to older models.

When to Consider Replacement 

While repair is often feasible for blown double glazing, replacement may be necessary under certain circumstances. Severe damage to window frames or irreparable glass panes warrants replacement to ensure structural integrity and efficiency. Similarly, outdated windows that fail to meet current energy efficiency standards can benefit from replacement with newer, more efficient double glazed windows.

Furthermore, homeowners should consider replacement if the cost of repairs approaches or exceeds the cost of installing new windows. Investing in modern double glazed windows not only enhances the aesthetic appeal of your home but also reduces energy consumption and utility costs over time.


In conclusion, addressing blown double glazing promptly is crucial to maintaining the comfort and efficiency of your home. By understanding the causes and effects of blown double glazing and exploring repair options, homeowners can make informed decisions tailored to their needs.

For residents of Glasgow dealing with blown double glazing, seeking professional services specializing in double glazing in Glasgow is advisable. These experts offer tailored solutions, whether through repair or replacement, to restore optimal performance and energy efficiency to your windows. Prioritizing maintenance and timely repairs ensures prolonged lifespan and enhanced sustainability of double glazed windows, contributing to a more comfortable and energy-efficient home environment.