Werkzoll (architecture)

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The excess of the surface of raw artificial or natural stone, which is removed during the later completion of the stone surface , is referred to as work or fractional duty (also working or stonemason duty ) . The resulting work pieces are used for natural stone masonry , as gemstones or sculptures .

After the raw block has been broken, the workpieces intended for construction are hewn into shape by stone carvers in the quarry , leaving a layer about 1 inch (around 2.5 centimeters) thick on the workpiece compared to the building dimension  . This layer, called work customs, is the result of the embossing and serves to protect the planned surface during transport from the quarry to the construction site and storage on site. This technique was used - along with other security measures such as cladding in clay or wood - primarily in Greek and Roman architecture .

Before moving a workpiece, the work inch is processed on the joint and bearing surfaces and the workpiece is then moved to its final position. Then the work inch of the visible surfaces is removed and the surface of a wall or a column, for example, is smoothed in one go or given its intended appearance. For aesthetic reasons, the work inch of the visible surfaces can also be left in place, in order to create the impression of a deliberate incompletion. Rustic masonry makes use of this effect.

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