Wood safety staircase

16.07.2019

Two minutes' walk from Zurich Altstetten station, a new apartment building is being built with over 30 apartments on seven floors. Since the tight space conditions do not allow access for the fire department everywhere, Timbatec's engineers planned a safety stairwell - made of wood.

Wood safety staircase

The first floor and the the second floor are used for commercial purposes and as a parking garage. They are of solid construction. The floors above the building of private investors private investors are made of wood. At the moment craftsmen are apartment building according to the plans of POINT Architektur + Planung. We support the architects and the timber constructors with our know-how in the field of statics, fire protection, building physics and work planning.

The exterior walls were prefabricated by Hector Egger Holzbau as conventional timber elements. Thus they can be assembled quickly and precisely on the construction site. The ceilings were also also arrived at the construction site as prefabricated box girder elements. Occasionally solid wood ceilings were used for structural reasons. For the apartment partition walls and the stairwell, cross laminated timber was chosen as the most suitable material.

Safety stairwell made of wood
Buildings with a total height of over total height of more than 30 meters are considered high-rise buildings in Switzerland. Such buildings are required by law to be equipped with safety staircases. The means that all vertical escape routes must be specially protected against smoke and fire. against the penetration of smoke and fire. If access for the fire department is impossible in the event of a fire, apartment buildings in the event of a fire, apartment buildings under 30 meters in height must be safety stairwell must be planned.

Until now, such staircases and staircases and escape routes were built in concrete. The fact that safety staircases staircases can be built in wood is demonstrated by the apartment building on the Albulastrasse: Here, the stairwell was constructed with cross-laminated timber and with 18-millimeter-thick gypsum fiberboard - encapsulated, as experts call it. call it.

Staircase core

View of the staircase core on the third floor during construction. The floor slabs were later floor slabs were later mounted.

Transition detail

Detail of the transition between the solid floors and the wooden structure. The timber elements are placed on a on a 30-millimeter-thick mortar bed and installed with segmental anchors. The encapsulated stairwell made of cross-laminated timber panels is clearly visible.

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