Review of the 10-storey day in Heilbronn
Ostfildern, 17 October 2018 Germany's tallest wooden building is currently being constructed on the Bundesgartenschauge site in Heilbronn. The Skaio, the name of the building, is a novelty and interesting for experts in many respects. That is why proHolzBW, in cooperation with the Heilbronn housing estate, the responsible architectural office Kaden und Lager and the construction company Züblin, organised a viewing day for the specialist public on 12 October 2018, ten days after the topping-out ceremony. Around 170 architects, engineers, timber construction contractors and decision-makers from politics and the housing industry accepted the invitation and took the opportunity to exchange ideas with the experts involved in the planning and implementation of the timber tower.
After the greetings of the managing directors of Stadtsiedlung, Bundesgartenschau and proHolzBW, Dominik Buchta, Hanspeter Faas and Christoph Jost, the visitors started the tour in small groups. Architect Markus Lager, Thorsten Kober (bauart Konstruktions GmbH, Berlin), Dirk Kruse (Dehne Kruse Brandschutzingenieure GmbH, Gifhorn), Anders Übelhack (ZÜBLIN TIMBER, Aichach) and Stefan Bärwald (ZEAG Energie AG, Heilbronn) received the guests at five stations distributed throughout the building to give lectures in which they presented the architecture, statics and building physics, the fire protection concept, the building construction as well as the building services and energy supply of the building. The guests were able to ask initial questions directly after the presentations. Those who first wanted to let everything have its effect had the opportunity to do so during the final discussion with all the speakers.
Skaio could set new standards for high-rise construction
According to the current status, class 5 buildings may only be built of wood in Baden-Württemberg, Berlin and Hamburg. As there are no comparable buildings yet, there are no standardised guidelines for the construction of wooden high-rise buildings (from 22 metres high). Experts are now hoping that Skaio will provide impetus for their development. "We are at a starting point similar to that experienced by multi-storey timber construction a few years ago," says Thorsten Kober. At that time, there were doubts as to whether multi-storey timber housing had any prospects at all. Today, as standardisation progresses, it has the potential to become the new driving force in the industry.
The experts have similar expectations for the work of the fire protection planners. Their concept was based on the general high-rise building guideline. The core of the guideline is the stairwell, which was constructed of reinforced concrete. In the event of a fire, it is pressurised so that no smoke or flames can penetrate. Even in the stairwell, the hazardous situation is the same as outside in front of the building. In the living areas, fire protection is achieved by the components which, according to Dirk Kruse, are impermeable to fire and smoke and meet the required fire resistance of 90 minutes without hesitation. The load-bearing walls and ceilings are also made of solid wood, which only burns on the surface. Glow nests or cavity fires that are difficult to fight cannot even develop in this way. The safety concept also includes a high-pressure sprinkler system. This is needed however only, in order to prevent the fire flashover possible by the soil-deep windows into a floor lying over it, so Kruse.
"The variety of the persons present today shows that the topic wood high-rise moves a whole industry. Here are architects and engineers, representatives from the municipalities, from private and public housing associations, carpenters and supplier enterprises , said Christoph Jost to the conclusion of the attendance day in of Germany first wood high-rise and supplemented: We are particularly pleased that with this building again a milestone of the timber construction in Baden-Wuerttemberg is set, the wood building federal state No. 1.