Poor installed windows and problems with the weather-resistant barrier installed between them and the walls, are common causes of moisture and damages. But these aren’t the only causes of condensation problems associated with windows.

Energy Efficient Windows And Condensation

Inefficient windows, namely leaky ones, are a common cause of condensation problems in bad weather conditions, and qualified windows may solve that problem. In cold weather conditions, their inside surface temperature remains higher than that of inefficient windows, making condensation much more unlikely to occur.

Weather-Resistant Barriers

Pay attention to the weather-resistant barrier installed between the frames of the windows and the surrounding walls. This barrier, typically made of perforated asphalt felt paper or woven waterproof polyethylene, is particularly important, mainly in wood-frame homes. It should be sealed at the edges and also overlapped at the seems. Without i, and a completely water tight installation around the window perimeter, the water will penetrate through the siding around it, causing condensation and other problems.

Flange Installation

The gap between the windows frame and the frame of the rough opening may also be a cause of leaks and condensation. Poor air-sealing of this gap is extremely problematic. Window installers should fill the whole gap carefully, and in several layers with polyurethane foam, in order to get a fully airtight window.

Pay Attention To The Windows Installation And Replacement

Window installation and replacement is a particularly sensitive job in cold-rainy climates.

Mold, rot and paint damages around window perimeters are often associated with weather barriers and improperly installed windows. Be careful. Choose a good installer, and pay attention to the replacement of old windows. When the weather-resistant barrier is disturbed, the risk of water damages are great.

Other Causes Of Condensation In Windows

Windows (and glazed doors and skylights) aren’t necessarily the cause of condensation and moisture problems, even when condensation appears on them. Many times, condensation occurs firstly on them just because windows have lower thermal resistance than floors or walls or other surfaces in the house… In other words, in many weather conditions the inner surfaces of the windows are the coolest surfaces in the house, and condensation appears on them just because of that and not because of them.

Episodic Condensation

Extreme outdoor temperatures combined with high interior water vapor, can cause condensation in windows, even if you have the most efficient windows, properly installed. And that doesn’t obviously mean that there are leaks or any structural problem.

We should not underestimate internal sources of condensation. People, plants, cooking, baths or laundry are important sources of warm air which may condensate in windows.

Obviously, that only becomes a problem if there is true leaks in the house and eventually in windows or around the windows. In that case the windows are a really source of condensation and moist problems.

Anyway,do not forget the importance of those possible indoor sources of moisture and condensation: clothes drying, overuse of humidifiers, baths, rainwater leakage.

Source: www.House-Energy.com

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