Abstract: The production of concrete building products having thickness in section of not greater than 15 mm includes forming a cementitious composition containing aggregate, hydraulic cement and water. The composition is shaped by a roller and slipper method to produce a shaped extrudate which is then divided into form sections. The sections are then cured to provide the aesthetically pleasing product. The cementitious composition also contains reinforcing fibres. The building products are used for roofing tiles or replacement of shingles, shakes and slates.