By Marianne Burkhalter, Christian Sumi, Yves Schihin, Urs Rinklef, Steffen Sperle, Célia Rodrigues, Unirenova (general contractor), Dr. Lüchinger+Meyer (civil ing.), Hector Egger (timber construction), G. Aerni (pictures), H. Unger (pictures)
The two-story plinth of the building of the railroad switching control room, dating from the sixties, is retained as a constituent element of the place. On it is raised a prefabricated wooden structure with four levels, with twenty-four home units of different dimensions. The apartments have a double exposition, fully glazed façades and overhung balconies on both sides with the function of prolonging the interior space, protection from weather conditions and screening from the sun. Access to the apartments is directly from the elevator. The ﬁre escapes are located in two projecting volumes on the north façade. Retaining the scansion of the pre-existing structure (see the longitudinal section), continuous KERTO LVL beams were installed, projecting on both sides of the building. These support the CLT wall elements on each ﬂoor while the box elements of the wooden ceilings are attached to them. The cladding of the ceilings of the interiors ensures the appropriate conditions of acoustic insulation and ﬁre protection. The superimposed volume is uniﬁed with the plinth by means of vertically striped plaster. The new volume can be identiﬁed only after careful examination by the unﬁnished sofﬁts of the balconies.