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Part L and Steel Windows Explained

The revised Part L of the Building Regulations that came into force in April have, at a stroke, done away with the marketing slogan assuring the specifier that any individual product complies with them.

The nature of the new Regulations means that the architect and designer can now take a holistic view of the building so as to combine the attributes of the various components - whether floors, windows, roofs or boilers - to achieve the target carbon emissions rating now demanded.

Guidance is given, in the case of windows, as to permissible whole window or maximum average U-value or a maximum centre pane U-value.

The material used for the frame is now immaterial as far as the Regulations are concerned. The U-values specified for windows are not concerned whether the frame is made of wood, upvc, or metal.

In this new less prescriptive marketplace, steel windows are able to offer the architect and designer a comprehensive range of high performance components suited to either new build or replacement situations, says Crittall Windows, which has published a new guide entitled Revised Part L Explained.

For instance, the Corporate 2000 high performance steel range has indicative U-values ranging from 1.7 to 2.5 W/m2K, depending on the configuration and glass type and size. They also all achieve a centre pane U-value of 1.2 W/m2K.Architects have always been impressed by the unique combination of superior strength and slim sightlines that only steel windows can provide. They can continue to take advantage of these properties, safe in the knowledge that the U-values will assist them in meeting the requirements stipulated in the revised Part L.

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Part L and Steel Windows Explained