25.3.12

The Big Problems With Secondary Glazing And Condensation

By Donald Stott


Two of the more common ways for homeowners to increase their home's energy efficiency is to install either secondary- or double-glazed windows. Both of these systems work relatively well for cutting heating and cooling costs and for reducing the 'carbon foot print' of the dwelling. They are not, however, equal in efficiency. There is a significant problem, for example, with secondary glazing and condensation build-up.

Those opting for double-glazed window installation should see their home's energy consumption cut in half in most cases. A good set of double-paned windows is an extremely efficient way of making an energy miser of your home. They will keep your home warmer in winter and cooler in summer. They will also insulate your living space from noise and dust, making it both quieter and cleaner.

One secret behind the effectiveness of a double-glazed window is the space between the two panes. This acts as an insulating barrier and, if properly sealed, will be very efficient in insulating that huge hole in your wall called a 'window'. This space may be filled with air or an inert gas (such as argon). It can also sometimes be void with a slight vacuum maintained in the space.

Sometimes 'Low Emissivity' (Low-E) glass is used, which significantly increases the window's efficiency. This Low-E coating, applied to one side of the glass pane, is able to keep the heat in your house by bouncing it back when it's trying to escape through the window. At the same time, Low-E allows the sun's solar rays through, making good use of the sun's warmth. It's a great technological innovation.

Because an air-tight seal is critical for double-glazed windows to perform properly, condensation (moisture build-up) is a rarity. Secondary glazing, however, does have problems in this area, due to its configuration. These are windows applied from the home's interior, right over the existing windows (usually single-glazed units). This method is not nearly as efficient as replacement with double-glazed models but may still be the best (or only) option in some cases.

Secondary glazing can be utilized without obtaining planning consent. If you happen to live in a Conservation area or your home is listed you may not be permitted to install newer style windows. The secondary glazing option may be your only recourse.

Secondary glazing and condensation problems associated with this method of upgrading your windows is something to consider. They will also cut your energy bill and reduce your emissions but only about half as much as the double-glazed units. Half, of course, is better than none and, in some cases may be the only alternative. Consider the options.




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