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Discoloration of Double-Pane Windows: What Causes It?

Double-pane windows can develop discoloration. What causes this, what does it mean and how can it be addressed?

In today’s post, Renewal by Andersen® of Austin, your local source of custom windows, explains the causes of double-pane window discoloration and what to do about it.

A Sign of Indoor Moisture

The presence of moisture can lead to window discoloration. Usually, this problem manifests as black or dark-colored streaks along the windows’ surface, consisting mostly of mildew or mold growth. It may or may not feel wet to the touch.

Discoloration on windows as a result of moisture can be caused by high relative humidity inside your home. This happens because of the amount of moisture or water vapor produced inside and outside the home and the rate it can replace damp indoor air with fresh outdoor air.

Should Your Repair or Replace?

If a double-pane window begins showing signs of discoloration, you can replace the glass pane while leaving the window frame intact. Depending on the state of the frame, however, it may be more cost-effective to just replace the whole window.

Preventing window discoloration starts with eliminating the source of the excess moisture inside your home. Investing in a dehumidifier can help, as well as installing exhaust vents in kitchens and bathrooms. Unclogging foundation drains and downspouts and installing moisture barriers in the basement also stop moist air from seeping indoors.

For your window replacement needs, turn to Renewal by Andersen of Austin. We offer high-quality replacement window units, including double-hung and casement windows. Our experienced window installers will help beautify your home with our top-notch installation methods. Give us a call at (512) 298-2270 or fill out our contact form for a virtual consultation. We serve homeowners in and around Austin, TX.


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