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Window Condensation: Causes & Cures

Condensation (afternoon)If you are noticing excess moisture accumulation on the inside of your windows, it may be an indication that humidity is exceeding desirable levels. Glass doors and windows are typically the coolest areas in a home. Since the cool air close to these glass surfaces cannot hold as much moisture as warm air, windows and doors are the first places that condensation gathers.

Sweating windows are not defective; rather, they are the most visible indication that your home is too humid, doesn’t have adequate ventilation, or both. If water is accumulating on glass, chances are it’s accumulating on other, harder-to-see surfaces such as wall and roof cavities.

Some suggestions to alleviate excess moisture in your home are:

  • Vent your crawl spaces and/or cover interior dirt spaces with plastic to create a vapor barrier.
  • Keep window coverings open during the day to allow air circulation and make sure patio doors have vents beneath them.
  • Run a dehumidifier in the basement can reduce musty odors and mold.
  • Minimize indoor firewood storage
  • Install energy-efficient windows and doors, such as those with insulating Low E II coatings!

See more information in this brochure from Marvin.


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