Hanser + Pfafferott from Kaarst were responsible for the natural stone work on the “Old Church” community center in Bochum. Master stonemason and sculptor Roberto A. Hanser talks about the challenges posed by the Armenian basalt on the construction site. STEIN: How did you come to work on the “Old Church Community Center” project in Bochum-Wattenscheid? Advertorial Article Parallax Article Hanser: We […]
Hanser + Pfafferott from Kaarst were responsible for the natural stone work on the “Old Church” community center in Bochum. Master stonemason and sculptor Roberto A. Hanser talks about the challenges posed by the Armenian basalt on the construction site.
STEIN: How did you get involved in the “Old Church Community Center“project in Bochum-Wattenscheid?
Hanser: We received a specification from soan architekten, submitted a bid and were awarded the contract.
Like the stone slabs on the “Square of theEuropean Promise“ in Bochum, the basalt used here comes from an Armenian quarry. The cutting and thesawnsurface were also carried out in Armenia. Were you satisfied with the natural stone material supplied?
The Armenian basalt is very similar to the Plaidter basalt from the Eifel. However, the workmanship, especially with regard to the dimensional accuracy of the bricks, was clearly outside the tolerance. With free lengths of 40 to 80 centimetres and a depth of nine centimetres, they were supposed to have a height of 15 centimetres. In fact, there were heights of 14.5 to 16 centimeters, sometimes even within a stone as a diagonal cut. This made the work extremely difficult, as the design of the façade is very graphic and strictly structured.
How did yousolvethe problem?
As the quantities supplied were not large enough to be able to sort out many workpieces, we had to mediate each stone by varying the joint size. Reworking or sorting out the delivered stones and the associated subsequent delivery would have been beyond the budget. It is important to note that the material was provided by the customer and we were not in contact with the supplier.
What are the characteristics of basalt? Why is it oftenused for construction projects?
Basalt lava is a very robust and versatile material. In modern architecture and garden design, it is used as a floor and wall covering, but also as solid workpieces such as steps, pillars, door and window jambs. Basalt also has a timeless effect due to its neutral coloring and fine-pored surface.
Were there any other challenges with this project?
There are always problems with construction projects of this size. After all, many different trades are working – often simultaneously – on a prototype that should not be perceived as such after completion.
What are the most important prerequisitesfor good and successful collaboration with all project participants?
Communication and fair dealings between all parties, i.e. planners, clients and craftsmen, and the willingness to work together and not against each other, are important.
Find out more about the natural stone work on the “Alte Kirche” community center in Bochum in STEIN in November 2016.











