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Unlike traditional windows, which are made of one pane of window glass, double-pane windows (or insulated windows) boast two panes, though it’s actually the space between them that does the work of keeping your home warm in the winter and cool in the summer.
The space between the panes is filled with air or dense gas (usually argon and krypton gases), whose molecules move slowly, keeping the air space at a consistent temperature. Consequently, the cold from outside moves more slowly through the window and into your home. Sometimes a desiccant material is added in the sealed space as well, as it can aid in moisture absorption, which prevents buildup of mold and mildew in the home.
Modern double-pane windows have two seals: the inner seal protects against moisture and corrosion while the outer seal holds the structure in place.
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While insulated glass windows are known for working extremely well under a lot of strain (changes in temperature, inclement weather, etc.), age will eventually corrode the seals.
The heat from prolonged direct sun exposure can cause the panes to expand and contract, which eventually weakens the contact between the window glass and seal. Water retention in the frame, improper drainage, and saturation of the desiccant can also compromise the seal.
When window seals have been compromised, moisture sneaks into the airspace between the panes and condensation forms on the glass. You’ll notice a milky or foggy look.
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One way to prevent condensation is to increase indoor air circulation. Every time you cook or shower, remember to turn on the kitchen or bathroom fan for at least 15–20 minutes. Use ceiling fans as well, even in winter. Set them to rotate in a clockwise direction, which will push warm air downward.
It’s also important to keep humidity inside your home in check. If you notice a humidity problem in your home, try a dehumidifier, which takes in air, sucks out the moisture, and releases it back into your home.
You can prevent condensation by simply keeping the windows open when the weather allows, which will release the warm, moist air trapped in the house.
Unfortunately there’s no easy DIY fix for condensation in your windows. Essentially, the moist air will need to be replaced with dry air, and for that you’re going to need to bring in the big guns— hire a professional.
That said, you do have two options. A professional can evaluate the right solution.
Because the dry air between the panes has been compromised, replacement of the window may be necessary.
You can save a considerable amount of money by replacing a single window pane instead of the whole window, though in cases of rotting, it may be best to replace the whole thing. A professional can evaluate whether a single pane replacement will do the trick.
As a less-invasive alternative, a glass professional can clean the window. The process entails drilling small holes at the top and bottom corners, spraying a cleaning solution through the top hole, and sucking it out through the bottom. An expert will then seal the holes with vent plugs, allowing air, water, and vapor to escape the window cavity freely.
HIRE: If a seal has broken or been compromised, House Method recommends contacting a professional to repair or replace your double-pane windows
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