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Posted by Harold on November 19th, 2002 02:46 PM
In reply to mold and sweating windows by Lisa LeDoux on November 19th, 2002 01:18 PM [Go to top of thread]

A single-glazed window has no insulating value. This means that the surface temperature of the window is the same as outdoors. It is merely silicone sand stone. this also means that the window surface is below dew point half the year, so you get the moisture to feed the mold.

Double-glazed windows cuts the heat lost in half and raises the temperature to one-half the difference from outside to inside. Moisture collection would then occur only 1/4 the heating season. More window layers reduces it more. Tight storm windows can help. Spraying closed-cell foam onto the undersurface of the floor can give a moisture barrier from the crawl space.

The baseboard under windows helps some because it makes the outside wall and windows just a bit warmer to raise the dew point. Although warm air heat does dry many homes to the point of nosebleed, in your area the air exchange would just bring in more moisture from the high humidity outside the home.

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