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Housing Easy Guide - British Precast
Floor insulation Floor insulation is supplied in boards with a standard size of 2.4m x 1.2m. These are most commonly made from expanded or extruded polystyrene, polyurethane foam (PUR) or polyisocyanurate (PIR). Expanded polystyrene is the cheapest option but gives a lower level of thermal performance than PUR and PIR. Extruded polystyrene
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