Window Condensation
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Window Condensation

Window condensation can be prevented with relative humidity conditions, with the inside temperature to correlate with the outside temperature, thus there will be no condensation.

Condensation (formation of moisture) on windows is the result of improved heating systems, better insulation, and houses that are tightly built. Homes today do not breathe through the many small openings that existed before the extensive use of storm sash, weather stripping, energy efficient windows, insulation, and central air systems. All these improvements are fuel savers and add to people's comfort, but they do promote annoying and damaging condensation and steps should be taken to prevent it.

Condensation on the inside window surfaces results from differences in outside and inside temperatures and from the humidity conditions inside the home. Warm humid air in the interior of the home, when temperatures are cold outside, reaches the dew-point necessary to condensation. Keeping the relative humidity within the home at a point lower than necessary for condensation to occur is the most effective way of preventing condensation on windows. There are maximum safe humidities for the home which are not only better for the windows, but they will also improve paint performance and insulation and will eliminate problems with structural members.

There are three ways to reduce humidity:

  1. Controlling sources of humidity. For instance, venting all gas burners and clothes dryers to the outdoors and using kitchen and bathroom exhaust fans helps remove excess moisture from the air.
  2. Winter ventilation of homes. Because outside air usually contains less water vapor, it will "dilute" the humidity of inside air. This takes place automatically in older houses through constant infiltration of outside air.
  3. Proper heating. Dry heat will reduce the relative humidity. It will counterbalance most of all of the moisture produced by modern living.

Fog on the lower corners of windows now and then is not serious. However, excessive condensation, condensation that blocks entire windows with fog or frost and produces water droplets, can stain woodwork and in some cases, even damage the wall's and plaster or drywall. Condensation on windows is easily seen and can be removed. More serious is excessive moisture in the walls and insulation, where it cannot be seen. High humidity resulting in condensation can contribute greatly to the deterioration of a house and to the discomfort of its occupants.

 If you have and older home, you can add calking and replace old casement windows, and even insulating all around the windows on the outside of the home will help with condensation. Taking that extra step in making your home more energy efficient will not only make the appearance of your home more appealing, but also save you money.

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Comments (2)

You have tackled a common moisture problem well with great remedies. Thank you for sharing your wisdom. Promoted since I am out of votes.

Excellent informative article on problems with window condensation. Well written and well done.

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