Can Window Seals Be Repaired? A Guide to Fixing Failed IGU Seals

When the insulated glass unit (IGU) seal in your window fails, it can be a frustrating and costly problem. However, there is often a solution that doesn’t require replacing the entire window. In many cases, you may be able to replace just the glass unit itself without having to replace the entire window frame. This can be a more cost-effective and efficient option, especially if the window frame is in good condition.

Understanding IGU Seals and Seal Failure

An IGU is made up of two or more panes of glass sealed together with a spacer around the edges. This spacer contains a desiccant material that absorbs moisture, and the entire unit is sealed with a rubber-like sealant. This creates an airtight and moisture-free space between the panes, which provides insulation and prevents fogging.

Over time, however, these seals can fail due to a variety of factors, including improper installation, damage from house painters using heat guns, or simply the natural aging of the materials. When a seal fails, it allows air and moisture to enter the space between the panes, leading to fogging, condensation, and a loss of insulation value.

Signs of a Failed Window Seal

The most obvious sign of a failed window seal is the presence of condensation or fogging between the panes of glass. This can occur on the inside or outside of the window, depending on the temperature and humidity levels. Other signs include:

• Drafts around the window
• Visible damage to the window frame or caulking
• Difficulty opening or closing the window
• Distortion or warping of the glass panes

Repairing a Failed IGU Seal

If you suspect that your window seal has failed, there are a few options for repair:

1. Replace the IGU: This involves removing the old glass unit and installing a new one. This is usually the best option if the window frame is in good condition and the seal failure is not due to a manufacturing defect. The cost can range from $100 to $600 or more, depending on the size and quality of the window, plus labor charges of $150 to $500.
2. Defog the window: Some window repair companies offer defogging services for windows with failed seals. This involves drilling a small hole in the glass, injecting a chemical to dry up the condensation, and then sealing the hole. However, this is a temporary fix and the window may quickly fog again. Cost is typically $60 to $100.
3. Replace the entire window: If the window frame is damaged or outdated, it may be necessary to replace the entire window. This ensures that all components are new and working properly, and can improve energy efficiency and curb appeal. Cost varies depending on the size and type of window.

If the window is under warranty, it’s important to contact the manufacturer to see if they will cover the cost of a replacement IGU. Some manufacturers have their own technicians who will come to the home and replace the IGU, while others will send a new IGU and the homeowner is responsible for paying a contractor for labor.

It’s important to note that replacing an IGU is a complex process that is usually best left to professionals. However, it is possible for a determined DIYer to tackle the project if the window frames are constructed in a way that allows them to be taken apart.

Preventing Future Seal Failures

To reduce the risk of future seal failures, it’s important to properly maintain your windows. This includes:

• Cleaning the windows regularly to remove dirt and debris
• Inspecting the caulking and weatherstripping around the window frames
• Avoiding the use of harsh chemicals or abrasive cleaners
• Protecting the windows from direct sunlight and heat

By taking these steps and addressing any seal failures promptly, you can help extend the life of your windows and maintain their insulation and energy efficiency.