Monk and Nun
Style of roof tiling using arched tiles in both layers / From Wikipedia, the free encyclopedia
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Monk and Nun, also known as Pan and Cover, Spanish tile, Mission tile, or Barrel tile, is a semi-cylindrical roof tile similar to Imbrex and Tegula, but instead of alternating rows of flat tiles (tegulae) and arched tiles (imbrices), both rows consist of the arched tile. The top row with the convex side facing up are the monk tiles while the bottom row with the convex side facing down are the nun tiles. Mortar is often used under the monk tile to firmly attach it to the nun tile, which also provides an extra seal against rain.
Roofs with terracotta Monk and Nun started appearing in Southern Europe during the Middle Ages. Originally, the tiles were made from locally sourced clay and given its shape with the help of a curved surface, such as a log or the maker's thigh. With time, regions developed a preference for a specific tile size, curve shape (profile), and color or colors.
Today, Monk and Nun tiles are mass-produced from clay, metal, concrete, or composite materials in various dimensions, profiles, and colors, including colors beyond the traditional red to brown palette.