HardieBacker Cement Board 1200 x 800 x 6mm (L x W x T) Grey is a backer board for tile and stone, used as an alternative for plasterboard for tiling floors, bathrooms/wet rooms and masonry walls. It is durable, mould and water-resistant. HardieBacker board fastens directly to any floor, wall or wooden frame and lines up perfectly with any drywall, making it particularly quick and easy to install.