Apartment building in the St. Johann district

Impact sound insulation of precast staircases. Sophisticated interior finish.

A house dating back to around 1910 was dismantled in the St. Johann district of Basel to make way for a new building on the narrow plot. The construction company was forced to allow car, bicycle and pedestrian traffic to continue and had to make do with a building site that was severely restricted.

The ten staircase elements were precast in architectural concrete at the factory, treated with Schöck Tronsole® products and shipped to the site where a crane lowered them individually into their exact position in the stairwell through an opening on the top floor. All of which took place without any standard fastening the elements – each weighing two tons – at the sides or on supports. After all, the challenge was to minimise the transmission of impact sound.

Installation was performed by the on-site construction manager in Davidsbodenstrasse. It did not take long to win foreman Paul Willig over to the product: "The self-adhesive technology of Tronsole® makes it quick to install, without the need for tools.” Depending on the construction workflow, the impact sound insulation can also be easily applied at the prefabricating plant.