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TOP OF THE SHOPS (Nov 2006)

High performance rigid polyurethane (PUR) was chosen for Checkers, Red Houses, an out of town supermarket development on the island of Jersey. This prestigious £9 million project, owned by CIT Estates, comprises a retail store area, offices, 12 staff maisonettes and full underground parking facilities and was been put forward for the Jersey Design Award.

The unusual large semi-circular flat roof could not have any drainage outlets, and posed quite a problem for Naish Waddington Architects as the roof build up had to be restricted. After consulting with the Kingspan Insulation technical department Kingspan Thermataper TT47 LPC/FM was specified as it enabled the main roof drainage at the edges to be achieved without having to slope the slab or provide a screed.

The product is designed for use under fully adhered single-ply waterproofing, and ensures low heat loss through the roof, as well as preventing the build-up of rainwater, which can seriously decrease the life of a flat roof by subjecting the membrane to thermal stress, alkali formation and mould growth. When correctly applied it offers continuous high performance throughout the lifetime of the roof. It is lightweight and easy to install, resistant to water vapour, and unaffected by compression inflicted in the course of normal maintenance. With a thermal conductivity of 0.027 W/m.K, the boards can easily achieve the U-values required for compliance with Building Regulations.