Green: School and Community Centre in Heidelberg

 - Jakob Schoof

The world's largest passive house district has been under construction in Heidelberg for ten years. After its completion in 2022, the Bahnstadt on the site of a former freight station will offer living space for around 6,500 people and employment opportunities for up to 6,000. An important communal meeting place for the new district has now been created with the school and community centre by Datscha Architekten from Stuttgart. The result of an open, two-stage competition held in 2013, it combines a triple-storey primary school, a kindergarten and a community centre. The new-build expresses its public character in a number of ways, through its location on Gadamerplatz in the geographical centre of the Bahnstadt, its low height and its brick facades stand out from the monotony of the surrounding white rendered five to six-storey apartment blocks.

Green: School and Community Centre in Heidelberg
© Stephan Baumann, bild_raum

The brick envelope extends over the entire height of the facade from the plinth to the edge of the roof. Even the concrete parapet is clad with thin clinker brick strips in order not to interrupt its homogeneous impression. In return, the architects divided the facade surfaces into horizontal strips of different coloured bricks, which were produced with a variation of the firing temperature as well as with engobes and a factory lime coating on the bricks. Wide frame elements made of sandblasted precast concrete frame the windows on the upper floors and the full-height glazing on the ground floor. The latter is continued between the three buildings in the form of colonnades separating the schoolyard from Gadamerplatz and from the smaller, more sheltered courtyard of the kindergarten. After school, the gates of the schoolyard are opened to the public. Only the courtyard of the kindergarten remains blocked by partition walls clad in dark wood and light-coloured fibre cement, which are only perforated by small peephole windows. Roof terraces are located on the single-storey connecting wings, some of which serve as extended courtyards for the school and kindergarten whilst one is used as a "smokers' balcony" for the community centre.

There is a surprising diversity of interior spaces behind the homogeneous façades. There is a hall with a stage at the centre of the community centre on the upper floor. In the primary school, the single-storey refectory provides a connection between the gymnasium in the south and the triple-storey classroom wing further north. In the centre of the school building, an atrium with wide stepped seating connects the three floors. While the common areas display a rather subdued colour palette with their dark concrete stone floors, exposed concrete and white plastered walls, the architects created orientation by the use of colour in the learning spaces. Each cluster of two classrooms and a smaller space for individual learning is fitted out with linoleum flooring in a different, vibrant hue, which is also repeated as a concrete glaze in the cloakroom niches in the vestibule.

The building complex covers its low heat requirement largely in a CO2-neutral way from the local district heating network, which is predominantly supplied by a wood-fired combined heat and power plant. Each of the four wings has its own ventilation unit with heat recovery. The supply and exhaust air volume can be adjusted in each room by volume flow controllers. Window ventilation is possible at any time and is the preferred means of fresh air supply in spring and autumn. On summer nights, the ventilation systems bypass their heat exchangers and direct the cooler outside air directly into the building in order to precool the rooms for the coming day. 

Architecture
Datscha Architekten
Location
Gadamerplatz 1-3, 69115 Heidelberg (DE)

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