Magnificent buildings are built and designed daily by talented men. Upon the completion of one structure, the next is begun. Our cities are built this way, they expand and age. These building grow older and begin to deteriorate. Some are lucky enough to be given historic status and are provided with a face lift that requires their original architecture to be preserved. Old wooden windows have to be restored or replaced with new wood frame windows. Builders are forced to increase the energy efficiency using secondary glazing, however there are problems that may occur due to secondary glazing and condensation.
Secondary glazing provides a single glazed window with an extra panel of glazing that is added to the inside. It is usually another single glazed panel of glass, but it can also be shrink wrap or a plastic film. It is most often surrounded by a metal frame with a gasket or membrane that creates what is supposed to be an airtight seal between the new and old glazing.
Although some people may be unfamiliar with all that secondary glazing entails, they do know what condensation is and how it happens. With windows, because they are glass, the interior and exterior temperatures are different, causing the moisture that is in the air by the glass to become cool and create a layer of condensation on the surface.
When it comes to wood windows, humidity and moisture are one of the things to avoid. They can cause warping and rotting, not to mention mold. Often times, problems are not identified until it is too late and the window has to be completely replaced.
Secondary glazing should not be confused with double glazing. Double glazing is sealed with a vacuum in a factory that is moisture controlled. Secondary glazing traps regular air, filled with moisture, between the new glazing and the single glazed panel of glass. A window that is drafty also allows moisture to settle inside, which increases the odds of the wood rotting. It also adds to the chances that the humidity level will rise between the panes of glass, effecting any wood that is exposed inside of the seal.
Another potential culprit is the metal frame on the glazing panel. Metal is also capable of transferring the temperature through the air and can also have moisture on it. Moisture on glass is easily seen, but when it is on the metal, it is not as visible.
Windows manufactured with a wood frame that are having moisture problems need to be replaced right away. This is usually a labor intensive, expensive project. When considering the best way to protect windows from the weather, it is necessary to consider all the choices available to you, and decide what is best. If you have wood frame windows, you may want to avoid secondary glazing due to the risks associated with secondary glazing and condensation.
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