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Why Are My Windows Molding?

Did you recently spot mold growing on your windows? Sometimes moldy windows are simply an eyesore requiring a minor cleaning project, but extensive growth that spreads throughout your home could easily cause health problems, including allergies and asthma.

By understanding why your windows are moldy, you can prevent the problem from recurring. In the meantime, you should either attempt to remove the mold or pursue a window replacement if the damage is too extensive.

Humidity and Condensation: Major Causes of Window Mold

High humidity, or excess moisture in the air, allows water droplets to condense on cold surfaces. This makes glass a susceptible surface for condensation. Winter is the time of year when window condensation is most likely to occur because cold conditions outside cool indoor air near the window. Cold air can’t hold as much water, so condensation forms as a result.

However, it’s not likely for mold to grow on the glass itself. Instead, water droplets roll down the window and settle on the sill. If you have unprotected wood windows, the water may not only encourage mold growth on the surface, but it can rot the wood as well.

Prevent Mold on Windows and Window Sills

There are things you can do to help prevent mold growth on your windows. Try:

  • Letting in sunlight when possible: Open the shutters, curtains and blinds. Even raising the blinds a few inches can not only let in light but also help with air circulation.
  • Circulating the air near your windows: Increasing the air circulation near the window surfaces can help prevent warm, moist air from becoming stagnant around the cold surface where the condensation can occur. Ceiling fans or even smaller tabletop fans can help with this.
  • Reducing moisture in the air: Use exhaust fans and consider using a dehumidifier if moisture buildup is excessive in your home (often do large loads of laundry? Cook every night?). Also be sure to open the windows sometimes.
  • Manually removing water: When you clean your house, don’t neglect the windows. Using a dry cloth, wipe the window sills dry. If you have older windows that aren’t as airtight, it may be beneficial to do this on a weekly basis.
  • Replacing your windows: If you have a lot of water on the sills—more than seems normal—it may indicate a leak. If your windows or leaking or just old (ones made even 10 years ago aren’t as airtight and energy-efficient as those manufactured today), replacing them is a good idea. New windows can help you save money and live more comfortably.

Remove Window Mold

If your windows are made of aluminum, fiberglass or vinyl, these non-porous materials are easy to clean. Simply apply a solution of bleach and water to remove mold from the surface. Make sure to wear rubber gloves to protect your skin.

If have wood windows, purchase a professional biocide to penetrate the porous surface and remove mold without damaging the wood. This technique also helps prevent mold from recurring. Apply a protective finish to the wood as an added precaution to protect it from rot if mold shows up again in the future.

Replace Your Windows

Sometimes mold can penetrate your windows deeply, making it difficult to clean them properly. If you discover your efforts to remove window mold aren’t enough to restore your windows to their former glory, contact Overhead Door Co. of Indianapolis & Muncie today. We have a wide selection of high quality window replacement options for your consideration!

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