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RCI March 2018

FLAT ROOFING & WATERPROOFING SYSTEMS Zink Copper Stainless 01992 801927 www.almhm.co.uk Twinfix marks the first-use of its bolted glass canopies Polycarbonate roofing supplier Twinfix has marked the first-use in the UK of its premium bolted glass canopy. Two of its new “spider-bolt” contemporary canopies have been used at the Trumpington Park Primary School, which supports the new Great Kneighton housing development near Cambridge, along with an existing secondary school and library building. Designed by architects Frank Shaw Associates for main contractor Kier, the design was based on Bulletin 103 guidance, but was developed in close consultation with the sponsor Cambridge Primary Education Trust (CPET) and Cambridgeshire County Council, and was tailored to suit the preferred educational vision and pedagogy. One 20m long canopy floats above the main entrance, while the other runs for 40m along the children’s outside activity learning zone. The former comprises 1.5m2 panels of 13.5mm of clear heatsoaked glass used alongside cedar wood panelling, the latter 3.2m long x 1m wide panels of 19.5mm, both with a 1.5mm interlayer of Polyvinyl Butyral (PVB) resin. Norman Paterson of Frank Shaw Associates said the Twinfix bolted glass canopies specification had been a main contractor preference, and they had “complied well” with the aesthetic and performance requirements of the project, and were a “good looking product”. He also said the canopies had provided “simple and effective details designed to be autonomous”, and added: “The building has been well received and is regarded as raising the bar for primary school design in Cambridgeshire.” The pre-drilled bolted glass canopies were installed to a 2° pitch by Twinfix’s in-house team, using a hired spider crane, tower scaffold, and walk-safe gutters to lift the 70kg panels onto an existing frame of vertical and horizontal galvanised steel supports. At Trumpington Park, the canopies are adjacent to the building’s façade above the galvanised steel plinth, while at the other end, they deliberately fall short of the horizontal supports at the entrance and overlap at the outside activity learning zone. These cantilever canopies are also designed to be reverse pitch to allow drainage into a gutter next to the building, and to keep the overall look sleek. Manufactured from galvanised steel and glazed with laminated glass, they are fixed using satin stainless-steel bolts with silicone seals. The use of bolts to fix the glass, rather than glazing bars, creates clean lines and large, open areas of glass. Through painstaking care the 3,380m2 building on a tight 2.3-hectare site is said to ‘significantly exceed expectations’ for this building typology. www.twinfix.co.uk


RCI March 2018
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