03:44AM | 10/18/03
Member Since: 03/01/03
22 lifetime posts
The interior of some of my windows are wet around the seals. Most of them are casements, but some of them are fixed. Their sweating right around where the seals meet the glass. How can I stop this? Why does it happen on the fixed windows that don't even open? I'm thinking cold air must be making it around the seals and into the house. Most of the seals look like they are in good shape. Most of the windows are Anderson, double pane, 10-15 years old. Thanks.


04:42PM | 11/08/03
Member Since: 11/06/02
1280 lifetime posts
Andersen has a pretty good network of independent installers and distributors. Try their website to find a contractor in your area to look at them.

My first thought is to ask whether you have done anything else to change the way your house works recntly, from paint to insulation or siding. Have you begun to use a humidifier or had a plumbing leak in the basement?

Most problems of moisture on inside of the glass or frame indicate excessive moisture inside the house. The window is always the coolest exterior surface so this is where moisture laden air will drop its load as condensation.

But is is possible that the seals are beginning to go bad.


08:27AM | 12/16/13
If you have blinds or curtains pulled, the air in the room won't circulate and condensation -- even ice -- will form. This will happen no matter what brand of windows you have. Showering and cooking while not running external exhaust fans can exacerbate the problem. Also, condensation can happen more frequently in bedrooms if you sleep with doors closed, since you exhale water vapor when you breathe.

Andersen Windows has a really great video that helps explain condensation, why it happens, and how to prevent it (I am not employed by Andersen, nor sell their products).

Here's the take-away from the video:

"Condensation doesn't mean there's a problem with your windows. In fact, the presence of condensation could actually be a sign that your windows have good, tight seals. Everything that makes homes more energy efficient also locks moisture inside your house and increases the chances of condensation forming."
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