Condensation will occur on any surface that is below the dew point of the air in contact with it (temperature at which condensation will occur at the existing humidity level). In most houses in winter, the inner surfaces of the windows are the coolest surfaces and condensation will usually occur there before it appears on other surfaces. It seldom appears on walls because they are normally warmer, although occasionally condensation may occur on cold spots such as nail heads and in the corners of outside walls where the insulation is reduced, or in confined spaces where the circulation of warm room air is restricted. In some cases this can lead to mildew and the growth of mould.
When condensation becomes excessive the moisture load must be decreased or the ventilation rate increased. To reduce the moisture load, humidfiers should be shut off, automatic dryers vented outdoors, clothes drying indoors avoided, and the structure checked for other possible moisture sources (ventilation, insulation and moisture barriers in the attic, basement or crawlspaces; open cisterns; seepage in the basement etc.)
This article was reprinted from the internet, the copyright belongs to the Respect Author/Website, please do not use for commercial purposes. Please feel free to contact us with any questions via Email.