Tillie Doyle
Double-pane windows are vulnerable to seal failure, which can be caused by moisture, mechanical stress, or improper installation. This can result in condensation, mould, or draughts, and may require resealing to restore the window's functionality and energy efficiency. Resealing can be done by specialists or through DIY methods, but it is important to address the issue promptly to prevent further damage and maintain the warmth and comfort of your home.
Double Pane Window Characteristics and Values
| Characteristics | Values |
|---|---|
| Window Seal Failure | Condensation or fogginess that can't be wiped off, damaged window frames, mould, chipped paint, peeling, draughts, higher energy bills, temperature fluctuations, window frame damage, water damage, difficulty opening or closing windows |
| Causes of Seal Failure | Moisture, mechanical stress, improper installation, use of heat guns or pressure washers, time |
| Solutions | Contact a specialist, buy a new glass unit, hire a defogging service, use a DIY defogging kit, reseal windows, replace the glass unit, use wood filler, sand the wood, apply primer |
| Cost | Varies depending on window size, fixing damaged panes, replacing a sash, defogging trapped moisture; estimated at $80 per window in Michigan |
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What You'll Learn
Failed seals: the most common issue
Failed seals are the most common issue with double-pane windows. Seals can be damaged by house painters using heat guns to strip paint or by homeowners using pressure washers to clean the windows. Improper installation can also cause a seal to fail. However, all seals will eventually expire. The International Association of Certified Home Inspectors estimates that the gas between the panes escapes at approximately 1% per year under ideal conditions.
When the seal of a double-pane window fails, the window loses its airtight ability, and the insulating gas between the panes is lost. This can cause the window to mist over or develop condensation or fogginess that can't be wiped off. This can be remedied by resealing the window, but it is extremely difficult to separate the panes from the internal spacer. It is recommended to use the services of specialised specialists.
If left unaddressed, a broken window seal can lead to higher energy bills due to temperature fluctuations. It can also cause water damage or mildew issues, making it difficult to open or close the window. In some cases, the frame may rot, causing the glass to move, slip, or eventually fall out. Therefore, it is important to diagnose the state of window units regularly and address any faults promptly.
To reseal a double-pane window, you will need to replace the failed sealed thermal unit. This involves removing the glass panes from the frame, separating the panes from the internal spacer, and resealing the panes with a new sealant. The process requires specialised tools and knowledge, so it is recommended to hire a specialist to perform the repair.
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Condensation and fogginess
The inner sealant is typically made of polyisobutylene (PIB), while the outer sealant is an elastic rubber-like seal or gasket that functions as an adhesive, holding the glass unit together. When one seal begins to break, the other can compensate for a while. However, as the window ages, its components begin to break down, and the window's ability to insulate is compromised.
The appearance of condensation or fogginess in double-pane windows can be due to changes in temperature and humidity. As the temperature drops, the molecules in the air get closer together, squeezing vapour droplets together, leading to condensation. This process is accelerated by direct exposure to sunlight, which causes the glass to expand and contract, weakening it over time. Water retention in the frame or improper drainage can also contribute to seal breakage.
If left unaddressed, condensation can lead to irreversible physical window damage, such as "riverbedding," where condensed vapour forms droplets that run down the length of the window, carving grooves into the glass surface. Additionally, mould or rot may develop, and the window frame may be at risk of water damage. To prevent these issues, it is recommended to address condensation promptly by hiring a defogging service or using a DIY defogging kit.
While some sources suggest replacing the entire window, others advise that simply replacing the glass can be a more cost-effective and eco-friendly solution. However, it is important to note that repairing or restoring the glass can be challenging, and specialised services may be required.
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Causes of seal failure
Double-glazed windows are the most vulnerable to seal failure, which can be caused by several factors. Firstly, old age; even the most robust sealants will eventually break down and become brittle, allowing moisture into the window unit. Excessive water exposure can also cause seal failure, as windows without proper drainage will suck moisture into the window units during expansion and contraction. Heat is another common cause, as it causes the window units to expand and contract, breaking down the seals and potentially causing cracks or softening the sealant.
Improper installation can also lead to seal failure. For example, if the window frame is not properly sealed, water can find its way in, causing the frame to rot and the glass to move and slip, eventually leading to seal failure. Additionally, using a heat gun or pressure washer to strip paint or clean the windows can damage the seals.
Another cause of seal failure is exposure to direct sunlight. The heat from the sun can cause the window units to expand and contract, breaking down the seals. This is particularly common in windows with a southern exposure.
Finally, seal failure can be caused by a failure of the desiccants within the window. Modern insulated glass windows have desiccants to absorb moisture and prevent fogging. However, if too much moisture penetrates the interior airspace, the desiccants can become saturated and stop working, allowing the window to fog and the seal to fail.
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Resealing methods
Before attempting to reseal a double-pane window, it is important to identify the signs of a faulty window seal. These include condensation or fogginess that cannot be wiped off the window, draughts, mould, chipped paint, and peeling. If you notice any of these issues, it is recommended to address them promptly to prevent further damage and maintain the energy efficiency of your home.
To reseal a double-pane window, you will need to gather the necessary tools and materials. These include wood filler, sandpaper, primer, and sealant. Start by inspecting the window for any gaps or damaged sections of wood. Use the wood filler to fill in these gaps and create a smooth surface. Once the filler has dried, sand the wood to prepare it for the next steps. Apply a primer to the sanded areas to protect the wood and enhance the adhesion of the sealant. Finally, apply the sealant carefully, following the instructions provided by the manufacturer. It is important to ensure that the sealant is applied evenly and securely to create an effective barrier against moisture and air infiltration.
For UPVC window seals, the process is similar, but it is important to note that UPVC is a more challenging material due to thermal expansion. In this case, it is advisable to seek guidance from specialised professionals who have experience dealing with UPVC seals.
While it is possible to reseal a double-pane window, it is important to consider the complexity of the task. Some window seals, especially those between the panes, can be extremely difficult to repair without specialised tools and knowledge. In such cases, it may be more cost-effective and efficient to replace the entire glass unit or seek the services of specialised window repair companies.
Additionally, if your windows are still under warranty, you may be able to receive a partial or complete replacement from the manufacturer. Therefore, before attempting any repairs, it is recommended to review the paperwork and contact the manufacturer to understand your options and make an informed decision.
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Prevention and maintenance
Double-pane windows are vulnerable to seal failure due to various factors, and proper maintenance and prevention are crucial to avoid costly repairs or replacements. Here are some preventive measures and maintenance tips for double-pane window seals:
Regular Inspection and Diagnosis: It is essential to regularly inspect your double-pane windows for any signs of seal failure, such as condensation, moisture, or a milky appearance between the panes. Early detection can help prevent further damage.
Control Sun Exposure: Direct exposure to sunlight can cause the glass to expand, contract, and weaken over time, leading to seal failure. While it is challenging to avoid sunlight altogether, managing the amount of direct sunlight on your windows can help extend the lifespan of the seals. Consider using window treatments such as curtains, blinds, or awnings to reduce direct sunlight during peak hours.
Proper Drainage: Ensure proper drainage around your windows to prevent water retention in the frames, which can lead to seal breakage. Check and clean your gutters and downspouts regularly to facilitate adequate water runoff away from the windows.
Maintain Window Frames: Well-maintained window frames play a crucial role in preserving the integrity of the seals. Regularly inspect and treat the frames to prevent rot and water damage. Keep an eye out for any signs of moisture accumulation or softening of the frame material, as this could indicate a potential issue.
Warranty and Professional Assistance: Many double-pane windows come with a limited lifetime warranty that typically covers seal failures within 10 to 15 years. Familiarize yourself with the warranty terms and conditions, including any transferability options if you purchase a home with existing double-pane windows. If you notice any issues, don't hesitate to contact a specialized window repair company or a local glass shop for professional advice and assistance.
While prevention and maintenance can help extend the lifespan of your double-pane window seals, it is important to recognize when replacement becomes necessary. If you notice significant condensation, cloudiness, or mould between the panes, it may be time to replace the entire window or the insulated glass unit (IGU), depending on the extent of the damage.
Remember that attempting to repair or replace double-pane window seals can be challenging and labour-intensive, so it is generally advisable to seek the services of specialized professionals to ensure a proper and long-lasting solution.
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Frequently asked questions
You may notice condensation or fogginess between the panes of glass, or temperature fluctuations leading to higher energy bills. There may also be damage to the window frame, such as mould, chipped paint or peeling.
It is possible to reseal a double-pane window yourself. The process involves applying filler to any gaps or damaged sections of wood, sanding the wood, and then applying a primer and sealant. However, it is recommended to seek the help of experienced specialists, as determining that the glass pack is depressurised can be difficult.
The cost of repairing a window seal can vary depending on factors such as window size, the extent of the damage, and the need for additional services such as defogging. Some companies may offer a free estimate, and in some cases, the repair may be covered under warranty.
