The Cassius is designed in collaboration with the UK's leading contractors and following four years of research and development, the New Cassius dramatically cuts the cost of a natural slate roof. This product replaces the old Cassius product and the two cannot be mixed. Finish the tiling within 15mm of wall, maintaining broken bond using tiles and half tiles and fixing all tiles. Features The New Cassius offers you a fantastic alternative to a natural slate roof, that’s not only a massive cost saving but, with its large format, open gauge and hidden interlocks it's simple and quick to install. The large format design and open gauge offer savings in material, labour, weight and completion times. The New Cassius is highly competitive with concrete thin leading-edge roof tiles Pressed from natural alluvial Humber clay, this premium material delivers improved longevity and natural beauty Clay's irregularity adds charm and texture to any roof Colour fastness No tops or eaves tiles required High performance weatherproof design developed through intensive wind tunnel testing with Sandtoft's century of experience in roofing