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Roman-roof-tiles-history, the romans certainly used clay tiles in england. they were of the "under and over" type ("tegula and imbrex"). a flat tray with curved up sides, the "tegula" was laid on the roof, and the joints between two trays were made rainproof by means of the inverted cylindrical "imbrex" tile covering them.. Roof tiles are designed mainly to keep out rain, and are traditionally made from locally available materials such as terracotta or slate.modern materials such as concrete and plastic are also used and some clay tiles have a waterproof glaze.. roof tiles are 'hung' from the framework of a roof by fixing them with nails.the tiles are usually hung in parallel rows, with each row overlapping the ...