Hardiebacker Cement Board for Floors is a backer board for us with tile and stone, as an alternative to plasterboard or plywood. The 6mm sheet gives excellent resistance to moisture and mould so won't rot, warp or swell, making it suitable for use in areas such as kitchens & bathrooms. The board is 90% cement and sand and has no loose aggregates or fillers providing a stronger and more durable board. It can be cut to any size by scoring and snapping and the clean cuts allow for the edges to align tightly.