Konkordiastrasse, Zürich

The project
In Zurich Hottingen, where Konkordiastrasse is located, there are many villas. Right next to the new building is a 300-year-old vintner's house. It characterizes the surroundings just as much as the old linden tree on the site of the new building. The architects' intention was that the polygonal shape of the new house should fit into the existing structure and mediate between the urban setting of the villas and the vintner's house. The new house has three full floors and an attic. Four apartments have space in it. The construction The space on Konkordiastrasse is limited. There are houses on three sides of the plot of the new building. In addition, the building was to be completed quickly. For these reasons, the decision was made in favor of an all-wood construction, since building with wood requires practically no construction site equipment.

The construction
Thanks to the timber construction method, the house was ready for occupancy within a year. From the ceiling of the basement, the house was built as a timber frame construction - including staircase and elevator shaft. The staircase walls were made of building materials RF1 with wood content (encapsulation K30-RF1). These building materials are covered on six sides with gypsum fiberboard. Thus, they are considered non-combustible building components and are equivalent to concrete or masonry walls in terms of fire protection.

The challenge
The stairwell required a special solution for sound insulation and fire protection reasons: it had to be completely separated from the rest of the building and made of RF1 components. This goal was achieved with double-shell walls.