Further to my other thread seeking advice on screeding a small section of floor (11 m2) ahead of the main house floor screeding I am now following @Mr Punter's suggestion to create a temporary floating floor capped with wooden sheet.   The width of the floor space is a round 2.4m which is convenient so I am looking at 1 x 3.3 sheets of wood (OSB or Ply) sitting over 100mm thick expanded polystyrene insulation sheet. I will probably  batten around the periphery of the floor to shop the