30 Think zinc
Jonathan Lowy of VMZinc looks at the precise requirements of a complex metal roof and addresses the aesthetics and challenges involved
The large choice of pre- weathered zincs now available offer designers an extended palette of aspects
T
he new library at Magdalene College in Cambridge – designed by Niall McLaughlin Architects – sits next to part of the old Jacobean manor making the use of red brick and gabled roofs no surprise. However the building was somewhat designed from the inside out with single, double and even triple height reading areas being resolved before the exterior was designed in detail. Both the red brick and timber feature heavily on the exterior and interior but a material that is only used on the exterior is the standing seam zinc roofing. The 45 degree pitched zinc roof combines with glazed gables that give the library a wonderful luminosity with baffles reducing glare from direct light in the reading areas.
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Much of the wood used on the interior is Cross Laminated Timber and this was also used as the structure for the roof. Light grey pre-weathered 0.7 mm thick zinc in 25 mm high standing seam panels, with 530 mm centre to centres, were installed over a non-vented, warm roof. A Brooft4 test demonstrating no fire spread or penetration was also carried out.
Non-vented roofing
One of the common misnomers of non- vented roofing – which is also known as warm roofing – is that the build-up is thinner than more traditional vented roofs. In reality, as all of the insulation is above the roof structure, warm roofs are nearly always ‘thicker’ than their cold roof
ADF OCTOBER 2022
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