How Double Glazing Works

We often hear about the insulation properties of double glazing, however many of us don't understand how it works and how it actually traps the heat in and keeps noise out of the home.

Simply explained, double glazing works on the principle that air, or gas is not nearly as good of heat conductor as materials such as glass. So, double glazing is made up of two panes of glass with a central area filled with inert gas. This layer does not conduct heat very well and so significantly limits the amount of heat that actually escapes through the window and outside of the home. This means in winter a double glazed window will keep your home insulated and is far more useful than a single pane.

The Science

To be more scientific, warm molecules move faster than cold ones. When one warm molecule bumps into another next to it, it shakes it and it starts moving equally as quickly. This continues and all the molecules begin to move faster and so conduct heat. Glass's molecules tend to be very close together and so conduct heat quickly. Air's molecules are further apart and so don't tend to conduct materials nearly as quickly.

To put it in more simple terms, the woolly jumper you wear is very similar. As the fibres of these jumpers trap air between them and also the warm molecules coming from your body. Wool jumpers slow down the molecules and form an insulated layer between your body and the outside world and so keep your body warm.

Argon

Many of the double glazing windows don't actually have air between them, they in fact have a gas called argon. This gas is inert and doesn't react with other materials and is a third poorer of a conductor than air. This increases how hard it is for heat to escape through the window, even more so.

Getting the difference between the inside and the outside of the pane is important. Panes that are too close together will transfer heat across either pane, whereas panes too far apart also cause problems. These panes have significant temperature differences and cause the air between panes to move around. This can allow heat to escape from one side to the other. The optimum width between the panes is 16mm - 19mm.

The Frame

These glass panes are placed between either wood, aluminium, or uPVC panels, though this is also to be considered. Aluminum is light and strong, however it also is a conductor of heat meaning an insulation has to be placed between it and the pane. Wood can also be used and is a great insulator, however it is manmade and can really wear with time.

UPVC frames are probably the best as they are both good insulators and also hard wearing. This makes them among the most popular choices for UK buyers as they offer the best of both worlds for those looking to use double glazing on their homes.

So, hopefully now you understand the differences between normal windows and double glazed windows.

Olivia Reynolds has written many articles about building, construction and home improvement having worked in the industry for many years. She now works with Top Tradespeople, a website where homeowners can find and compare quotes from local tradesmen, including double glazing companies.

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