The floor comprises a plurality of insulating panels 102 positioned between adjacent beams 10a, 10b of a plurality of beams, with an air gap beneath the beams and at least one insulating panel, the lower surfaces of one or more of the insulating panels comprising a reflective covering 9 forming a continuous reflective covering over at least a part of the lower surface of the floor. The reflective coverings may comprise a foil. A portion 9a of the foil may extend beyond the lower surface of the insulating panel and beyond the adjacent beam to cover and be fixed by adhesive on the foil to the lower surface or opposite side of an adjacent beam. There may be an air gap between the foil and the lower surface of the adjacent beam. The foil may be fixed to the foil of the opposite insulating panel adjacent to the adjacent beam. The lower surfaces of the beams may have a foil separate from the foil of the panels to form the continuous reflective covering. Also claimed is an insulating panel comprising a reflective covering. Protrusions 4a, 4b of the insulating panels may sit on ledges 10a’, 10b’ of the beams.
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