New Windows: What does sustainability mean for glazing?

Greener Windows, lower energy bills

This page links to the Government Buying Standards for windows – a simple way to ensure you meet sustainability standards when procuring replacement windows or double glazing.

 Greener Windows, lower energy billsWhat does sustainability mean for glazing?

Efficient glazing can have a significant impact on energy use. It not only helps keep heat in, but also reduces the demands for artificial lighting. The glazing industry measures the energy efficiency of glazing through the British Fenestration Rating Council (BFRC) Window Energy rating scheme, which gives an A to E rating for windows in terms of their solar factor (the heat gain through sunlight), thermal transmittance (how well heat is prevented from escaping) and air leakage.

What windows are recommended?

Windows that are triple-glazed and injected with Krypton Gas maximise their energy efficiency and reduce your carbon footprint.

With low U Value of 0.65 W/m2K, and a centre pane value of just 0.6 W/m2K, these windows, that are available in roof light and traditional window forms. See here.

As well as checking the energy rating, it’s also worth looking at the materials used in the frame: timber, for example, will require more upkeep during the frame’s lifecycle than plastic.

All central government departments and their related organisations must ensure that they meet at least the mandatory Government Buying Standards when buying goods and services in the product groups covered on this site.

However, as windows are essential to the overall environmental performance of a building it is also advisable to consult the BRE Green Guide to specification.

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