Steel for warmth and quiet

A design professional has specified a high-performance, triple glazed composite screen from a member of the Steel Window Association to keep the heat in and the noise out.

Steel Window Service and Supplies was approached by Hannah Mercedes-Carter to fabricate and install the 5.5m-long screen, featuring two double doorsets, for a rear extension to her house in Hackney. The screen, which comprised five separate elements, was produced using W40 sections with the proportions being optimised in terms of appearance and the physical limits imposed by incorporating triple glazing.

Hannah, who works for a leading London interior design practice, said: “For the original loft conversion, we specified double glazed aluminium windows which look OK but have tended to suffer from condensation, so I was determined to avoid that problem with this addition of a large kitchen dining room extension to the rear of our property.

“I was also keen to use steel frames as they are in keeping with the style of the building which dates from the 1930s, and chose to work with Steel Window Services and Supplies because of my experience using them on an office project in London.

“The triple glazing and frame make-up was also intended to prevent any noise intrusion from outside the building; now they are installed, I realise just how seriously sturdy and secure they are. We are very happy with the way they look and perform.”

The appearance of the classic W40 section has been enhanced by the application of a RAL 7016 anthracite grey polyester powder paint finish over the standard galvanised coating; complemented by matching trickle vents and satin chrome ironmongery.

The frames are infilled with 28mm thick triple glazed IG units using a mix of clear toughened Planitherm One safety glass for the inner and outer leafs, and a clear toughened Planilux safety glass centre pane. The cavities are filled with 90% krypton gas and super spacer bars. This achieves a centre pane U-value of 0.602W/m2K while the installed screen offers an overall U-value of 1.5W/m2k, along with the required sound reduction properties.