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Smooth triple-curved Kal-Zip aluminium standing seam roofing sheets and crimped curved Kal-Bau trapezoidal liners were chosen by architect Couves, of Newcastle, for the roof of Procter and Gamble's headquarters extension at Gosforth. The materials, both from Hoogovens Aluminium Building Systems, were installed by roofing contractor Briggs Roofing and Cladding.Main contractor for the project was Sir Robert McAlpine. CONSTRUCTION NEWS