St. Stephens Cathedral is the famous landmark of Vienna. The Dome was erected in the 14th and 15th century and was devastated by fire at the end of World War 2. Within the reconstruction works the old demolished roof timbering was replaced by a steel roof framework that had to carry the new enamelled roof tiles and to stabilize the ancient gothic stone walls. Waagner-Biro as one of the leading Austrian steel structure companies was ordered to fulfil this task and performed the new roof framework structure in the years 1950 until 1951.