The Alpine asbestos slate works “Durit” with their headquarters in Villach started a production plant in Wietersdorf in the immediate vicinity of the cement works. In 1915, the works was taken over by the Knoch brothers who started the production of roof slates on the so-called “Prosig” machine. In the war years, cement was crucial for the building of emplacements, and for this reason a considerable share of the production was sent to Tarvisio in Italy. Due to the First World War, the production of asbestos-slate plates was suspended, and it was not until 1919 that it was resumed.
