Scratch joint
The scratch joint is an architectural design element.
Originally, the joints between the stones of a masonry were richly filled with mortar and this was scratched around the stone before it hardened, so that a frame was created around the stone. These frames were often filled with a thin layer of plaster that completely covered the stones.
Rasa Pietra plastering was often used in medieval buildings such as castles . (= elapsed stone). With this technique, the mortar was spread between the individual bricks until the wall formed an almost flat surface, but the stone heads remained uncovered. Sometimes joints were also drawn into the damp mortar with a trowel in order to obtain a joint pattern (“joint line”).
Today, when scratching the joints, joints are scratched into the smooth plaster of masonry and often given a contrasting color. This suggests that it is stone-faced masonry.
literature
- Werner Priegnitz : “Remnants of the old craft of grouting in the old town of Magdeburg” , 1950
Individual evidence
- ↑ Plaster after the surface design
- ^ Report on the restoration of the tower facade of the Gaukirche in Paderborn, accessed on September 13, 2014