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General information

  • Location address
  • Location country
  • Name of the client/building owner
    ÖBB-Infrastruktur Bau AG
  • Function of building
    Vehicle services
  • Degree of enclosure
    Open structure
  • Climatic zone
    Temperate - cold winters and mild summers
  • Number of layers
  • Type of application of the membrane
  • Primary function of the tensile structure
    • Rain protection
    • Wind protection


For over a century, the elegant arched roofs of the main station have been a landmark on the city skyline; their gently curving steel framework strong yet delicate to the eye of the passing traveller. However, the new requirements of a transit station coupled with analysis of weather observations over many years concerning snow and wind load meant changes were necessary for the longitudinal roofing structural system.
The contractor therefore specified the construction of a membrane roof including a substructure on the basis of the historical roof construction. For this reason, the Austrian national railway (ÖBB) stipulated a translucent membrane roof made from PTFE fabric whereby just external loads – snow and wind – would be transferred onto the existing construction at precisely determined points.

SEFAR® Architecture TENARA® Fabric 4T40HF was the preferred choice of Architects kadawittfeld architektur from Aachen and build Eng. contractors Zeman & Co from Vienna in view of its flame resistance, water resistance and durability.
With the dismantling of the steel framework – around 2500 individual pieces with a total weight of 250 tons – and the reconstruction by Zeman, the two roof arches which were originally separated by a restaurant are now riveted directly together above platform 2 and platform 3. These are fitted with 1400 running meters of Sefar fabric, divided into 24 single panels. The membranes are arranged lengthwise in sections running from the eaves to the roof ridge, and in width they always take up the space between girders and rafters, or rafters and rafters. On the eaves, there is a two-level snow guard system fitted to the membrane construction.

Description of the environmental conditions

Material of the cover

  • Cable-net/Fabric/Hybrid/Foil
  • Material Fabric/Foil
    SEFAR® Architecture TENARA® fabric 4T40HF

Main dimensions and form

  • Covered surface (m2)

Duration of use

  • Temporary or permanent structure

Involved companies