Zwyssigstrasse 5+7, Zürich
2018
The new replacement buildings in Zurich Altstetten are among the first projects that can do without concrete in the stairwell as well. This has been possible since the revision of the fire protection guidelines in 2015.
The project
The initial situation was the same as in many other places: old apartment buildings from the 1950s on a site that could be much better utilized according to today's standards and requirements. The architects recommended a replacement building in timber construction.
The two apartment buildings, each with 14 apartments, are purely wooden structures from the first floor slab upwards. The combination of polycrystalline photovoltaic modules on the balcony parapets and the horizontal wooden facade give the buildings a distinctive character.
The construction
The two apartment buildings consist mainly of prefabricated wooden elements filled with rock wool insulation. The floor slabs are made of solid wood. The staircase was also constructed from the renewable raw material: It consists of cross-laminated timber that was encapsulated with a gypsum fiberboard for fire protection.
The challenge
There were very few right angles in the architects' design. This led to a complex structural concept. Furthermore, the rooms were to be flooded with light as much as possible. Therefore, Timbatec planned the beams into the ceiling.
Construction Data
- Cross laminated timber 600 m3
- wooden stud walls 3'800 m2
- Wooden formwork 1'900 m2
Services of Timbatec
- SIA phase 31 preliminary project
- Cost estimate
- SIA Phase 32 Construction project
- SIA Phase 51 Implementation project
- Fire protection planning
- SIA Phase 41 Tendering and comparison of offers
- Statics and construction
- Technical site management and site inspections
Timber contractor
Hector Egger Holzbau AG
4900 Langenthal
Architect
Kämpfen für Architektur AG
8048 Zurich
Photos
Kämpfen für Architektur AG
8048 Zurich
Timber construction engineers
Timbatec Holzbauingenieure Schweiz AG, 8005 Zurich