The 116m high Gothic tower of Freiburg Minster, Germany, is dated to about 1300. Its 45m high spire is unique in terms of architecture and building technique.
Rainer Barthel reports on the extensive investigations and research programmes which were undertaken in order to develop an efficient and minimised repair concept.
Rainer Barthel is a structural engineer. He is a partner in the company Barthel & Maus, consultant engineers in Munich and Professor at the Technical University of Munich.