1. Home
  2. Double Glazed Window
  3. Reseal Double Glazed Windows: A Comprehensive Guide to Energy Efficiency
Cynthia C. Shaw
Cynthia C. Shaw
Content Specialist

Reseal Double Glazed Windows: A Comprehensive Guide to Energy Efficiency

Expert solutions for homeowners to reseal double glazed windows. Ensure energy efficiency and comfort with professional resealing services. Contact us now!
Reseal Double Glazed Windows

Table of Contents

Reseal double glazed windows It is essential to preserve the integrity of our windows if we want to create a cozy and welcoming home atmosphere while efficiently controlling energy expenses. Double-glazed windows are a top choice when exploring different window solutions due to their exceptional thermal efficiency and impressive noise-reduction properties. The key to their excellent performance is an expertly constructed airtight seal, which guarantees maximum performance.

Whether you are a homeowner dedicated to enhancing energy efficiency or a passionate advocate for sustainable living practices, understanding the importance of addressing the resealing needs of your double glazed windows is crucial.

By taking proactive steps to uphold this airtight seal, you not only boost the eco-friendly features of your residence but also elevate its overall comfort levels. This thorough guide is designed to provide an in-depth walkthrough of the resealing procedure, empowering you to fully capitalize on the energy-saving advantages that double glazed windows bring.

Importance of Well-Maintained Windows for Energy Efficiency

Importance Of Well-Maintained Windows For Energy Efficiency

Before diving into the intricacies of resealing techniques, it’s crucial to highlight the pivotal role well-maintained windows play in energy conservation efforts. Windows serve as a bridge to the external environment, allowing natural light and fresh air into living spaces. They could, however, also serve as a source of weakness in the insulating system of a house.

A U.S. Department of Energy analysis states that windows may account for up to 25% of energy inefficiencies in dwellings. Windows also significantly increases heat gain and loss in homes. Thus, ensuring proper maintenance of double glazed windows is the primary defense against energy wastage. By taking a proactive approach to window care, homeowners benefit from notable reductions in energy consumption, leading to decreased utility costs.

Understanding Reseal Double Glazed Windows

Understanding Reseal Double Glazed Windows

To fully grasp the importance of resealing, it is crucial to delve into the intricacies of double glazed windows. These specialized windows, also called insulated glass units (IGUs), are constructed with two glass panes separated by a layer of inert gas like argon or krypton. This static gas layer enhances the thermal efficiency of the windows, outperforming regular air in terms of insulation.

The innovative design of double glazed windows plays a vital role in minimizing the transfer of heat and cold through the window, resulting in superior insulation properties. This enhanced insulation helps maintain consistent indoor temperature but lands the rece on heating and cooling systems, promoting energy efficiency.

Moreover, apart from their thermal benefits, double glazed windows are also remarkable for their noise reduction capabilities. This feature makes them particularly appealing to homeowners residing in bustling urban settings or near high-traffic areas.

Signs of Deterioration

Signs Of Deterioration

How can you tell if the seal on your double glazed windows is failing? Keep an eye out for these clear indicators of deterioration: Condensation appearing between the panes, noticeable gaps or cracks in the seals, drafts seeping through the windows even when shut tight, and a decline in energy efficiency resulting in increased utility costs. If you observe any of these warning signs, it is prudent to consider repairing or replacing your double glazed windows.

Fogging Between Panes

If you observe condensation forming or notice a milky appearance between the glass panes of your windows, it signifies a compromised seal. This breach permits moisture infiltration, which then disrupts the insulating capabilities of the gas layer, potentially affecting the window’s overall performance and energy efficiency.

When this seal is compromised, the trapped moisture can lead to mold growth, further deteriorating the window’s structure and potentially impacting indoor air quality. You and your family may continue to live in a healthier and more energy-efficient home by taking quick action on these critical concerns.


Feeling a draft near your windows on a windy day is a clear signal that the airtight seal is no longer intact. This compromise in the seal can lead to increased energy consumption as your home becomes more susceptible to heat loss during the winter and heat gain during the summer. The inefficiency caused by the compromised seal may result in higher utility bills and discomfort due to temperature variations in your living space throughout the year.

Additionally, the presence of drafts can also impact the overall comfort of your home by allowing dust and allergens to enter, potentially affecting indoor air quality. You and your family may live in a healthier, more energy-efficient home by addressing these primary concerns as soon as possible.

Condensation on the Inside

While humidity levels and temperature variations can lead to condensation inside windows, abnormally high condensation could indicate a potential issue. To prevent water damage, maintain the structural integrity of your house, and keep your home dry and comfortable overall, you may need to reseal. The possibility exists that overspray might conceal the problem and provide a shelter for mold and mildew, which could be dangerous to your health and degrade the air quality in your house. 

By addressing condensation promptly and effectively, you can ensure a healthier living environment and prolong the lifespan of your windows and home infrastructure.

DIY Resealing Process

Diy Resealing Process

Suppose you’ve noticed condensation or drafts on your double glazed windows, indicating the need for maintenance. In that case, considering embarking on a do-it-yourself (DIY) resealing project  might be a good idea. This task is typically quite manageable for many homeowners, as it requires only essential tools and materials that are easy to acquire.

Resealing your windows can increase energy efficiency, boost insulation, and extend the life of your double glazing, all of which will save you money over time. The following parts will provide you with a detailed supply list and a step-by-step tutorial to assist you in finishing this beneficial job and guaranteeing the best possible performance from your windows.

Tools and Materials

  • It is essential to carefully choose a sealer that is utterly compatible with the glass and frame materials used to guarantee a secure fit.
  • When removing the old sealant, a putty knife or a similar tool is recommended to ensure effective removal without causing any damage to the surfaces.
  • The new sealant should be applied evenly and precisely using a caulking gun for a polished and professional finish.
  • Before sealing, it is essential to gather cleaning supplies to prepare the area thoroughly. Preparing the surface for sealing entails clearing away any residue or debris.

Step-by-Step Instructions

  1. Assess the Damage: Start by carefully inspecting the entire perimeter of each window to identify any areas requiring resealing. Remember, it’s crucial to not just focus on visible issues but to conduct a comprehensive assessment for effective results.
  2. Prepare the Area: Thoroughly clean the window frames and glass to ensure optimal adhesion of the new sealant. When cleaning, use a light detergent; avoid abrasive cleaners as they might damage the glass surfaces.
  3. Remove Old Sealant: Delicately scrape off the old sealant using a putty knife, being cautious not to cause any damage to the glass or frame. This step is vital to facilitate proper bonding of the new sealant and establish a durable, airtight seal.
  4. Apply New Sealant: Load the caulking gun with the fresh sealant and apply it evenly along the cleaned edge where the glass meets the frame. Press the sealant firmly into the joint to guarantee thorough coverage.
  5. Smooth and Clean: Once the sealant bead is applied, use a moistened finger to smooth it out, then wipe off any excess sealant from the glass and frame using a damp cloth before it sets.
  6. Test the Seal: Allow the sealant to cure per the manufacturer’s guidelines, then test the windows for drafts. Monitor their performance over time to ensure the effectiveness of the sealing process.

Benefits of Resealing

Benefits Of Resealing

The advantages of resealing your double glazed windows are extensive:

  • Enhanced Insulation: By establishing a proper airtight seal, the gas between the panes can efficiently regulate heat transfer, thereby improving the thermal efficiency of your home and creating a more comfortable living environment.
  • Energy Efficiency: Resealing provides better insulation, which lessens the need for excessive heating and cooling. Over time, this lowers energy consumption and utility costs. It lets you live a more sustainable lifestyle and is better for your budget.
  • Protection Against Moisture: Beyond air infiltration, a secure seal prevents moisture from seeping in, safeguarding your window frames and the structural integrity of your home from potential water damage. This proactive measure helps maintain the aesthetics and functionality of your windows.
  • Prolonged Window Durability: Performing routine maintenance, such as resealing your windows, is essential to prolonging their longevity. By preserving their structural integrity and efficiency, you ensure that your windows continue providing optimal comfort and value for many years.

Professional Resealing Services

Professional Resealing Services

While DIY resealing can be a feasible choice for minor fixes, there are scenarios where seeking professional help is undoubtedly the wiser decision. In particular, for problems involving significantly broken glass, frame, or sash or chores requiring more than a simple reseal, the professional’s experience is strongly advised for an exhaustive and efficient resolution.

Professional intervention ensures that intricate repairs are handled with precision and that the longevity of the fix is maximized. Additionally, professionals can identify underlying issues that DIY approaches might overlook, providing a comprehensive remedy for sustained structural integrity.

When to Seek Professional Help

  • Dealing with Extensive Damage: When the window unit itself is significantly damaged, opting for a replacement or seeking professional repair services might be more economical than trying a do-it-yourself approach. Doing so can ensure the repair is completed accurately and completely, preventing further problems.
  • Handling Complex or Multi-Pane Windows: Double glazed windows with intricate designs, like those with multiple moving parts or specialized coatings, require specific skills for effective resealing. Ensuring the proper resealing of these windows is crucial to maintaining their efficiency and longevity.

Cost Considerations

The kind of window material, the size of the windows, the degree of damage, and the labor rates in the area may all affect how much professional window resealing will cost. When contemplating whether to tackle a do-it-yourself resealing project on more oversized windows, weighing the potential risks against the energy savings from properly sealed windows that function optimally is essential.

Investing in professional resealing services provides peace of mind and ensures long-term advantages for your home. By engaging experts, you can be confident that your windows are meticulously sealed and well-maintained, contributing to a cozy and energy-efficient living space.


Resealing your double glazed windows is an investment in your home’s comfort and energy efficiency. By understanding why and how to reseal, you empower yourself as a homeowner to take charge of your residential energy consumption and contribute to a more sustainable future.

Remember, the most minor details in your home’s infrastructure can have the most significant impact. Regular checks, timely maintenance, and the occasional resealing can make all the difference in keeping your double glazed windows at peak performance.

Include resealing double-glazed windows in your regular home maintenance to enjoy the pleasure of an airtight seal and the knowledge that you’re actively lowering your energy expenditures and carbon impact. Take the reins of your home’s energy efficiency—your future self will thank you.

Request a Quote

Looking for some help with your project?