Crossing (stonemason)
A crossing or a crossing piece is introduced as a stone replacement piece into a defect on historical buildings made of natural stone or on new buildings in accordance with the applicable DIN 18332 for natural stone work.
The making of crossings is a handicraft activity of the stonemasons in their field of activity of stone restoration . The imperfection on a building is worked out at right angles by hand with appropriate stone cutting tools, morbid substance is removed and care is taken to ensure that there is minimal loss of substance. Then a replacement piece made of natural stone, accurate to the millimeter, is made and fitted or wedged with mortar.
The minimum edge length of a stone masonry crossing should be 10 centimeters and the embedment depth at least 8 to 10 centimeters. A crossing should never bridge existing joints.
For centuries, crossings have been made on structures built by stonemasons. Crossings are frowned upon on building sculptures, as significant art-historical building substance would be lost due to the required perpendicularity. In these cases, an application is made , as is the case with small imperfections up to about 100 cm² with mineral, construction resin or silica gel-bound restoration mortar .
literature
- Michael Berude: Stone restoration and monument preservation . In: Bildungszentrum für das Steinmetz- und Bildhauerhandwerk (Ed.), Steinmetzpraxis, The manual for daily work with natural stone, 2nd revised edition, Ulm 1994. ISBN 3-87188-138-4 .
Web links
Individual evidence
- ↑ crossing. In: Angela Weyer et al. (Ed.): EwaGlos. European Illustrated Glossary Of Conservation Terms For Wall Paintings And Architectural Surfaces . English Definitions with translations into Bulgarian, Croatian, French, German, Hungarian, Italian, Polish, Romanian, Spanish and Turkish. Michael Imhof, Petersberg 2015, ISBN 978-3-7319-0260-7 , p. 324 ( download ).