Youth Center Ingersheim

Real-World Laboratory S210: from construction aid to permanent architecture: Repurposing concrete formwork from the Stuttgart 21 project into a local youth center.

Completed in the summer of 2024, the new youth center in the municipality of Ingersheim directly repurposes temporary concrete formwork as load-bearing structural elements. Located in the Fischerwörth area, this real-world laboratory comprises twelve decommissioned cross-laminated timber (CLT) elements from the Stuttgart 21 construction site, offering approximately 50 square meters of usable floor space. Through this direct reuse approach, the building successfully bridges a local youth project with the interdisciplinary academic research of the universities in Konstanz, Stuttgart, and Karlsruhe.

Completion

Summer 2024

Usable indoor space

50 m²

Planning & Concept

Andreas Kretzer, Stefan Krötsch, Roman Kreuzer, Katharina Raabe, Maximilian Stemmler

Execution planning & site supervision
Construction company

Claus Kofink
TPW Bau GmbH

Holzbau Koch GmbH
Specialized planning

Faltlhauser Krapf 
Beratende Ingenieurgesellschaft mbH (structural planning)
Ingenieurbüro Westram

Other project partners

HTWG Konstanz
HFT Stuttgart
HS Karlsruhe
proHolz Baden-Württemberg
Züblin Timber GmbH
Ed. Züblin AG

ZAB
ZAB

The design inverts the conventional planning process: instead of dictating a shape, the planners developed a new spatial structure based entirely on the fixed geometry of the available 3D-curved formwork, which originally shaped the concrete for a pedestrian underpass. Rather than sending the milled CLT for thermal disposal after its initial use, the elements were stripped of their coating, sanded down, and installed as load-bearing walls and roofing. To protect the massive, untreated wood surfaces from the elements, the structure was enveloped in an independent, elliptical shell made of solid structural timber and wooden cladding. This facade is entirely reversible, relying on screws rather than adhesives or varnishes, and avoids the use of foils, except for the roof waterproofing. Funded by the municipality with a budget of around 100,000 euros, the building sits on a conventional reinforced concrete slab with base walls, as a fully demountable screw foundation was not permitted due to strict flood protection regulations at the site.

The entrances to the building are concealed behind the outer wooden slats. This prevents direct views from the outside, preserving the intimate, labyrinthine character of the interior space.

Text: ZAB | Sources: Gemeinde Ingersheim, HTWG Konstanz, HFT Stuttgart, HS Karlsruhe, proHolz Baden-Württemberg, Züblin Timber GmbH, Ed. Züblin AG