NorDan, the leading provider of high performance environmentally-friendly timber windows and doors, now offers a U-value of 1.2W/m²K as standard, meaning the manufacturer’s standard window range has earned the name that’s synonymous with low-energy performance – NTech.

The improvement in performance has been achieved through the addition of a new higher performance low-emissivity coating, a warm edge spacer and Argon gas filling. These factors combine to improve NorDan’s standard double glazing U-value to 1.2W/m²K, a substantial improvement on the current Building Regulations standard for timber windows of 1.8W/m²K, so all of the manufacturer’s standard products will now carry the NTech name, superseding the previous NTech Low Energy range.

Another alteration to the standard design is that all NTech products are to be supplied without trickle vents as standard, improving air tightness and energy efficiency. NorDan can still supply units with integral trickle vents on products over a certain width, if required.

In addition to improved energy efficiency, the NTech range’s new glazing construction, with 6mm external glazing, has the benefit of enhanced soundproofing, with sound reduction levels improving from 31dB Rw with the previous design, to 37dB Rw with the new NTech glazing. Further glazing specifications are available to match the project.

To ensure all window designs benefit from the improved U-values and soundproofing of the new NTech design, additional gaskets have been incorporated into NorDan’s outward opening windows, also improving weathertightness.

Where even higher levels of performance are required, NorDan’s NTech Passive triple-glazed range offers an exceptionally low U-value of just 0.7W/m²K. This industry-leading design has been specified in major projects such as the Kingspan Lighthouse and the Barratt Green House, where its exemplary energy efficiency has helped specifiers to achieve Level 6 of the Code for Sustainable Homes.

Ross Leishman, NorDan’s Technical Market and Systems Manager, commented: “These changes to upgrade our standard range to NTech level are great news for specifiers and architects. They will make product specification straightforward and help to achieve high levels of energy efficiency as standard.”