Stackable roof tiles with hanging nib(s)

摘要

Flat roof tiles are stackable such that lower surface regions 54 of each tile contact the upper surface 32 of the tile below in the stack, preventing the hanging nib(s) 50 contacting the upper surface 32 of tile below. Lower surface 54 may consists of a plurality of ribs, the tile may be made of concrete by extrusion and may have ventilation holes between its upper and lower surfaces and complementary interlocking means on its side edges. A pack or a method of forming a pack of cambered roof tiles involving reversing the orientation of a second row of stacked tiles is also disclosed.