Multi family house Unterhub, Zollikerberg

The Project
The above-ground structure is a timber construction consisting of wooden columns and cross-laminated timber panels connected using TS3 technology. Timber Structures 3.0 technology, or TS3 for short, is a method that enables the creation of large-scale timber structures—without the joists traditionally required. TS3 connects glued-laminated timber panels rigidly to one another via their end faces. This allows for floor slabs that extend from the warm interior into the cold exterior. These details were evaluated and optimized using isothermal calculations. For planning details such as the connection of windows to the ceiling, it is advantageous that building physics and structural solutions come from a single source.

The Construction Method
The TS3 connection using joint grouting enables the construction of beam-free timber frame structures with slender, point-supported panels. By activating the secondary load-bearing direction, the same types of floors can be built using wood. Due to wood’s low thermal conductivity, there is no need for complex cantilevered slab connections. The CLT panel can simply extend from the interior to the exterior. The concrete stairwell stiffens the building.

The Challenge
The stairwell is constructed of monolithic concrete without decoupling measures at the stair runs and landings and without impact sound-insulating flooring. The floor slabs attached to the stairwell were installed with acoustic decoupling, and a cladding shell was installed on the apartment side.