Double glazed windows and doors are made from two panes of glass that are separated by a layer of air or gas and then sealed. The use of two panes of glass dramatically reduces noise and heat transmission.
The use of a gas, most often argon, is preferable between the layers of glass as it is considered to be a superior insulator than those with just a sealed pocket of air. For optimum thermal performance, double glazing should have a space of 16 to 20mm between the panes.
In a standard single glazed window, both heat and noise are easily transferred. In summer, sunlight heats up your house and in winter, heat escapes from inside your home to the outside. You pay more for heating and cooling costs and all year-round, noise can easily pass through the window. Visit our ‘Why Double Glazing’ page for more information on the benefits of using double glazing.