|Roman 'tegula' roof tile with dog paw prints
The roof of the Whitehall Villa was composed of two types of tiles called tegula and imbrex. The tegula was a rectangular tile with raised edges on its two long sides which ended with indented joints - these tiles abutted, and were jointed into, one another to form the basic slope of the roof. To make the roof waterproof, the raised edges of the tegula were covered by a convex tile called an imbrex.
This tegula is of particular interest as it is nearly complete and because it has been cut across the angle, indicating the complexity of the roofing structure.