1st prize for the Couplage project by the team of W2H Architekten AG, Bern

The new building on Uttigenstrasse in Thun blends into the existing row of buildings with clearly structured, orthogonal structures and strengthens the urban structure with precise access and active outdoor spaces. New tree plantings define the square in front and emphasize the special position of the cartridge factory on the street. With its stepped height development and slender proportions, the project ensures appropriate densification and blends harmoniously into the cityscape.

The structural concept combines a solid concrete core with a precisely dimensioned timber support structure that encases the building and is both statically and ecologically convincing. The core provides the bracing, while wind bracing in the facades over two storeys ensures additional stability. The ceilings are made from the innovative Rematter^® system, in which solid timber beams with clay infills not only meet high fire protection requirements, but also set new standards in terms of ecology and recyclability. Thanks to optimum spans and a column grid adapted to the system, the result is an economical, material-saving construction with reduced building height and high flexibility of use. The loads are efficiently transferred via beams and a load-bearing concrete ceiling in the basement.

SNBS Microclimate 143 - Unsealing and shading

• Unsealed surface & infiltration: Generous green zone between new building and railroad line improves microclimate and water retention.
• Shading & reflection reduction: Planted outdoor spaces, ventilated facades and green roof surfaces ensure a pleasant climate and reduce heat build-up.

SNBS reuse and system separation 213 - from the outset and interdisciplinary

• Demountable construction: timber and ceiling systems can be dismantled non-destructively, no need to use liquid plastic.
• Accessible technology & flexible use: building services compactly routed, installations easily accessible and easily adaptable.

SNBS greenhouse gas emissions 311-313 - wood, clay and PV also on the facade

• Effective choice of materials: timber construction and Rematter^® ceilings made of wood and clay reduce emissions during construction.
• Energy in operation: PV on the roof and facade as well as district heating reduce CO₂ emissions in the long term; rail connection strengthens sustainable mobility.

Biodiversity 341 - integrated in a natural way

• Native plants & habitats: At least 80 % native species, extensive green roofs and nesting opportunities for fauna.
• Diverse environment: Different areas and dry stone walls along the railroad line promote biodiversity and ecological permeability.