Sandstone is a robust sedimentary rock, made up of compacted grains of sand. It is hard-wearing, frost-resistant and low-slip – properties which make it the perfect choice for external paving. Sandstone has graced pavements and gardens in the UK for centuries. With a ‘seasoned’ finish, a process that softens the coarseness of the stone, sandstone can also be used for interior floors, giving an authentic old flagstone look.