It is arched by a one-ply, transparent ETFE-membrane and stands out owing to its lightness and the open view of the mountains it affords. The information centre occupies a topographically interesting site: All the buildings are integrated into the slope and the flat grass-covered roofs blend in with their surroundings. The only object that catches the eye is the triangular transparent roof structure. The support-free load-bearing structure comprises arched girders of prefabricated laminated wood with a span of 27m, which transfer the load onto the slope via the adjacent buildings. Anodised aluminium tubes with a diameter of 90mm and lengths of up to 8m extend from the girders every 1.25m, creating a secondary structure.
A membrane, which is fixed to the underside with membrane clips to secure it against the wind, is stretched across the tubes. The edges of the membrane are fastened like swags with newly developed stainless steel clamps. The ideal combination of material and structure provides durability and low maintenance costs. The 390sqm roof is the first and largest ETFE project carried out in Germany that comprises a single assembled and mechanically installed membrane. This construction method was also used for the AWD-Arena in Hanover in 2005 and for the National Stadium in Beijing in 2008 and has become a standard building technique.