62 EXTERNAL ENVELOPE
VARIETY
As well as sliding door applications in residential settings, sectors taking advantage of their benefits include leisure facilities and zoos (ZSL Whipsnade shown below)
some manufacturers are compromising the required aluminium thickness. For effective long-term performance, a specifier should make clear the minimum requirement in accordance with standards such as BS 6375 Part Two - Specification for operation and strength and BS 4873 - Specification for aluminium alloy windows and door sets. To put the value of technical input from a manufacturer into perspective, fenestration accounts for up to 40 credits of the 119 available in a BREEAM assessment. Consequent demand for lower U-values and collaboration with specifiers therefore prompted Kestrel Aluminium Systems to develop a 70 mm casement window. Scheduled to be available early in 2020, it will provide the highest standard of acoustic performance and weather tightness – a clear illustration of innovation driven by design needs. Projects that have benefitted from such collaboration include the newly refurbished and renamed ‘Ellen Terry Building’, part of Coventry University. The Grade two listed, art deco, former Gaumont Palace Theatre’s design required an elegant run of modern, thermally broken commercial doors that matched the original facade. In addition to the
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minimum requirement of PAS 24 the specification included incorporation of card scanners and perfect replication of the original doors’ slim sight lines. This has been achieved through use of ‘lay bars,’ leading the University FM team to comment: “These new doors have recaptured the original design purpose while the increase in natural light has resulted in consistently positive feedback.” A limited refurbishment schedule also placed pressure on HTL Windows and Doors to undertake a frontage upgrade on the entrance to ZSL Whipsnade, the UK’s largest zoo. A five-week period prior to Easter gave little time for manufacturing, fabrication and installation of automated doors, which considerably exceed Building Regulation requirements, a 60 mm window system and 125 mm curtain walling. Consequent enhancement of natural light allows visitors immediate views into the main zoo areas but just as importantly for the client the end result makes a clear statement about ZSL’s standards for Whipsnade’s facilities management in the 21st century.
Ian Osborne is technical manager at Kestrel Aluminium Systems
ADF DECEMBER 2019
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