Perfect for use within the building trade, removals and also warehouse dispatches. our packs of 12 sheets (hence 48 total) of thick expanded SDN polystyrene sheets (EPS 70). The size of each sheet is 2400x1200x25mm (8ftx4ftx1"). EPS70 expanded polystyrene sheets are used for a large variety of purposes. These include the following: To place between joists to provide insulation, below floor screed, below concrete slabs, for postage & packaging - to protect items from breaking and movement.