Cover stone

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Covering stone on a sandstone wall
Covering stones (also roll layer) on a dry stone wall as a wall crown

A cover stone ( . Engl coping stone , capstone ; fr. Pierre de couverture ; . It copertina di petra ), also called coping, the upper end of a free-standing wall serves. A cover stone is made with a roof that drains the condensation and rainwater to the side. A so-called water nose is hammered or sawed in below the overhang of the wall . The purpose of the water nose is to ensure that the rainwater drips off in front of the wall and does not soak it. A cover stone itself protects the wall against the penetration of precipitation into the butt joints and strong moisture penetration. Roof tiles and concrete slabs on walls fulfill similar functions.

Quarry stones can be piled up on dry stone walls and form a so-called wall crown . As the upper end of the wall, they should make it difficult to climb.

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