Rob Firman, Technical and Specification Manager at RAVATHERM UK – manufacturer of POLYFOAM Extruded Polystyrene (XPS) insulation – highlights the risks of inaccurate U-value calculations and the need for a more rigorous approach during the specification process.

In recent years, the world of construction has seen significant growth in the number of Special Purchase Vehicles (SPV) set up by a number of large businesses to deal with one-off projects.

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