used hardboard sheets (Nailsea BS21)

8 feet by 4 feet hardboard sheets, useful to protect floors during building or DIY projects. The upper surfaces have marks and stains which testify to their history, but the undersides are clean and sound, which is what counts. There are 8 in total, which is enough to cover an area of around 250 square feet, but have as many or as few as you wish.