Why It's Important to Repair a Broken Window Seal
Condensation on windows that can't be removed with a cloth is a clear indication that the seal of the window has broken. It also affects the insulating ability of your home and could cause distortion of views through the glass panes.
Defogging may temporarily solve the issue however the most effective solution is to replace the IGUs (IGU). This is best handled by a professional window manufacturer to ensure the replacement is done properly.
Expansion & Contraction
Over time, seals in dual pane windows break down due to expansion and contraction of the spacer between the glass. This happens due to the cycles in temperature that occur throughout the day. When the sun warms the glass, it expands, putting pressure on the window seal. As the glass cools down at night, the seal on the window shrinks. These constant expansion and contractions could cause a crack in the window seal, permitting humidity to enter the window, causing fog between the glass panes. The inert gases such as argon that are trapped between the window panes also escape through this break in the seal. This greatly reduces the insulation value of the window.
Stains or mold along the edges of double-pane windows are also indicators of a leaky seal. You may also notice an increase in your energy bill or feel drafts around the windows. As the process progresses the window frames could be pulled away or shift from the wall. This is a sign you must replace the window seal.
Replacing the seals on windows with dual panes is a complex and labor-intensive project that typically involves removing the old seal as well as the new one, then cleaning both of the windows and replacing the IGU. Although it is possible to replace the IGU by yourself, hiring a professional is strongly advised. Incorrect decisions during this process could result in water damage, drafts, pest infestation and even more expensive repairs later on.
A professional can assist you in finding the most appropriate repair solution for your situation and provide advice on how to keep the seal on your window over time. This could include a short-term solution, such as caulking the gap between the frame of the window and the wall to block bugs and water from entering your home, or it could require replacing the entire window with an IGU that is more resistant to weather conditions and damage to the seal. You can also put in an entirely new window that has an alternative IGU with more seals or is more suitable for the climate of your home.
Weather Conditions
Window seals are designed to withstand the harshest weather conditions. However, prolonged exposure can cause them to break. The most common culprits are extreme temperature variations that cause the glass to expand and contract, putting pressure on the window seal over time. This is particularly the case in homes that are located in areas that experience hot summers and cold winters.
Window seals are also susceptible to damage due to storms, high humidity and other environmental conditions. Wind can be particularly hard on windows and cause them to shift over time. This can cause fogging or condensation if air is trapped between the glass panes. While fogging is not a safety hazard however it can affect the appearance of your windows and make them difficult to look through.
repairmywindowsanddoors and humidity can also cause window seals' to wear away through causing rot to the frame or growth of mold. If you are experiencing these issues, it's likely that the window seals need to be replaced.
Another sign that window seals are beginning to fail is higher energy bills. The cooling and heating systems will have to be more efficient to keep your home warm if the seals on your windows have failed, which will result in higher energy costs for you and your family.
You may be noticing that it's getting more difficult to open and close your windows. This indicates that the window seal has become stiff, preventing it from opening and closing. This problem must be dealt with before it becomes a major problem or your windows won't be as energy-efficient as they could be.
Follow the maintenance guidelines given by the manufacturer to extend the life of the window seals. It is important to clean them regularly with mild detergents or other approved cleaning agents, and to keep them free of debris and dirt. Avoid using heat gun and chemical strippers to clean your windows. These can easily break down the sealant.
Damage
Modern triple and double pane windows are different from the older single-paned windows. They have glass panes that are separated by air spaces, and then completely sealed around the edges. This keeps moisture out. Often, the spaces between the glass panes are filled with an inert gas, such as argon or krypton in order to reduce transfer of cold or heat outside the window. These kinds of windows are also known as insulated glass units (IGUs).
If you notice condensation or other signs of broken window seals, you should to call a professional to evaluate the situation and decide the best course of action. Ignoring this problem will only cause more damage which will result in higher energy costs and a decrease in the comfort of your home.
Generally speaking, the cheapest alternative is to replace the IGU, while preserving the existing window frame. This is especially advantageous in the event that the frame is in good condition and has a higher R-rating than your original windows, allowing you to retain a large amount of insulating efficiency.
If the frame is damaged, old or has any other exterior damage that is in poor condition, you might be considering a full window replacement for the highest energy efficiency and security. A professional can carry out this type of repair effortlessly and quickly, restoring your window's insulating properties while also improving the appearance of your home.

If your window is covered by warranty the installer or manufacturer might be willing to replace or repair the damaged IGU at no cost. If you're unsure about this, look up the warranty for your window or contact the installer to see whether it is possible.
Installation
Window seals play an essential role in keeping drafts away and ensuring that your home is energy efficient. It's not only important to repair a damaged window seal as soon as you notice it, but also perform preventative maintenance that helps to avoid problems in the future.
Window maintenance is a continual process that involves examining for gaps, cracks, and re-caulking if necessary, as well as cleaning. Re-caulk the window seals at least once each year to limit the effects of moisture and temperature. This is especially important for older homes where foundations have settled since their initial installation.
Regularly checking your windows for damage helps you identify problems before they become an unsound seal, and you can arrange an appointment with a professional to repair the issue when required. If you notice condensation between your window panes, this is a sign that the frame and glass aren't properly sealed and this can lead to poor indoor air quality. In addition, if you can hear a tapping sound when you push on your window, it's a sign that the window is loose and requires repair.
A window seal may also break when the frame of the window is damaged. This can happen when your pets or children accidentally strike a window with a broom, or when harsh cleaning products, such as paint strippers were applied too close to windows. It could also happen when windows are fitted with aluminum frames that don't provide as much insulative value as fiberglass or wood.
A broken seal is best replaced or repaired if your windows are still under warranty. This will not only ensure that your window is replaced or repaired quickly however, it could provide you with the chance to upgrade to a more energy-efficient frame material, such as wood or fiberglass.
If you find an IGU (IGU) which is damaged and requires professional help to replace it is generally the most cost-effective, long-term and economical solution. It's important to note, however, that many modern windows have removable IGUs that contain gas that insulates that allows you to replace only the glass unit rather than the entire frame and window.