Capstone

A cover stone (English coping stone, capstone, French pierre de couverture; . Copertina it di petra ), also known as wall cover, the upper end of a freestanding wall serves. A cover stone is performed with a roofed by that drains the dew and rain water side. Below the wall supernatant so-called water nose is hammered or sawed. The water nose is intended that the rain water dripping off the wall and does not soaked. A cover stone itself protects the wall against penetration of rainfall in the joints and strong wetting. Similar functions meet roof tiles and concrete panels on walls.

On dry stone quarry stones can be stacked, forming a so-called mural crown. As a top termination of the wall they make it difficult to exceed.