Bummerlhaus, 4400 Steyr
Built in the last quarter of the fifteenth century, the Bummerlhaus with its main façade facing the square is considered one of the most outstanding examples of middle-class profane architecture of the late Gothic period in Austria. The medieval façade design wasn’t restored until the 1950s, when layers were uncovered and lost parts reconstructed. Initial restoration was conducted to clean the façade, which had been severely soiled by soot from the nearby main bus station. Beneath the layers of dirt and mineral deposits the conglomerate stone of the ground floor was in relatively good condition, whereas, one story higher, the tracery balustrade carved from calcareous sandstone was crumbling and weakened by many small cracks. The blind arcades directly beneath the gable had received several layers of plaster over the years, all of which were removed during restoration to reveal the original layer of fine lime plaster. This layer was retouched using lime mortar. Due to binder deterioration, the sandstone masonry had to be consolidated three times with silicic acid ester (Wacker OH)prior to cleaning and removal of unwanted layers. Artificial stone mortar with Portland cement as a binder was used for patching and replacing missing parts. The lime slurry was adjusted to match the original, a warm gray tone, and over that the joints were painted to correspond with the pattern and state of the original. Finally, the entire façade was treated with a waterproofing agent.
Address: 4400 Steyr, Stadtplatz 32
Service: Stone and plaster restoration
Service period, pilot project: September to October 1998
Service period, restoration work: April to July 2000
Last updated: 07/07/2015 Imprint ©2015 Denkmalpflege G.m.b.H. & Mag. Klaus Wedenig Restaurierung & Konservierung