Resonant façade by Glas Trösch

The “piezo” metal discs integrated in the SWISSLAMEX Colordesign laminated safety glass by Glas Trösch produce the image of a stylised wave. As vibrating sound bodies, they generate the sound of flowing water.
Photo source
© Claudine Garcia & Marcel Kultscher

Date: 19 February 2021

Renovation of a vocational school in Lausanne with façade glass from Glas Trösch

The EPCL vocational school in Lausanne (Ecole professionnelle commerciale de Lausanne) exemplifies how the renovation of a building can turn it into a work of art. The educational complex, consisting of the school building and a sports hall, dates back to the early 1970s and was given a new glass façade as part of an energy-efficient refurbishment project, a façade full of surprises: round “piezo” metal discs were integrated in the façade glass that, like the membranes of a loudspeaker, make the entire building sound like running water.

As a symbolic reference to the River Flon flowing in an underground canal in the same district, this idea was the result of a cooperation between Chiché Architectes and the artist Rudy Decelière. The architects, the artist and a team of experts from Glas Trösch developed an ingenious solution to add a visual accent to the installation.

The miracle of energy-efficient refurbishment: the new glass façade of the sports and school complex of the EPCL vocational school in Lausanne has changed the 1970s building into an example of energy-efficient architecture with a sound experience.  Photo: Claudine Garcia & Marcel Kultscher
The miracle of energy-efficient refurbishment: the new glass façade of the sports and school complex of the EPCL vocational school in Lausanne has changed the 1970s building into an example of energy-efficient architecture with a sound experience.
Photo: Claudine Garcia & Marcel Kultscher

The architecture of the school complex dating back to 1971 is a typical example of post-war modernism in the region: in the 1960s, the Swiss canton of Vaud developed a school construction programme that was to increase the number of schools cost-efficiently and in a short time in order to cope with the strong growth in the population.

For this purpose, the Centre de rationalisation et d’organisation des constructions scolaires (CROCS) devised a rational construction method which became known under the same name in its abbreviated form: the CROCS system was the basis for a total of 27 school complexes built between 1965 and the start of the global oil crisis in the mid-1970s.

The buildings are characterised by their rectangular floor plans and the cubic shape of the structures, as well as the construction method: a self-supporting, modular metal support structure forms the basis for all floors and rooms, the technical infrastructure and, last but not least, the façade with its large window areas.

Equally characteristic of buildings from this period is their problematic energy balance: while energy aspects did not play much of a role in those days, leaks and the inadequate insulation of the outer shell of buildings have proved to be symptomatic of the architectural heritage.

The miracle of energy-efficient refurbishment: the new glass façade of the sports and school complex of the EPCL vocational school in Lausanne has changed the 1970s building into an example of energy-efficient architecture with a sound experience.  Photo: Claudine Garcia & Marcel Kultscher
The miracle of energy-efficient refurbishment: the new glass façade of the sports and school complex of the EPCL vocational school in Lausanne has changed the 1970s building into an example of energy-efficient architecture with a sound experience.
Photo: Claudine Garcia & Marcel Kultscher

 

Revitalisation with sound waves

When Chiché Architectes from Lausanne won the contract for the energy renovation of the school complex in the district of Vallée de la Jeunesse in a competition in 2011, they involved artist Rudy Decelière in the planning of the façade from the outset. With his poetic sound sculptures, Decelière had attracted the attention of the architects in the triennial “Bex & Arts” exhibition.

The architects’ concept envisaged much more for the renovation than just improving the energy balance. The school complex was to gain vitality during and outside the hours of use, take up the characteristics of the original CROCS system as well as the genius loci in a new form.

From the desire to meet these diverse requirements and, at the same time, give the building something completely new arose the idea of constructing a glass façade in front of the building that, also in a figurative sense, would focus on something which had never been seen before: sound waves.

They make the façade sound like the irregular murmur of running water – a symbolic reference to the River Flon, which originally flowed through the area. During the Expo Lausanne in 1964, urban planning measures canalised the river underground so that it disappeared from the landscape.

The new façade effectively recreates the orthogonal grid of the building designed on the basis of the CROCS system. Photo: Corinne Cuendet / Chiché Architectes
The new façade effectively recreates the orthogonal grid of the building designed on the basis of the CROCS system.
Photo: Corinne Cuendet / Chiché Architectes

 

Art and technology in harmony

After several tests with prototypes in cooperation with the experts from Glas Trösch, the search for a technical implementation of the design concept for a new façade, which was to transform the building into a synaesthetic experience, was successful.

The SWISSLAMEX Colordesign laminated safety glass by Glas Trösch proved to be the perfect solution for the façade elements: round “piezo” metal discs are inserted between two layers of laminated safety glass and wired so that they can each be addressed, using amplifiers, with the sound composed by Decelière.

Around 13,000 “piezos” of varying sizes are aligned in the individual elements, together forming a stylised wave which extends over the entire building on 690 square metres of façade surface. The additional colour foils in black inserted between the two layers of glass highlight the golden shimmer of the “piezos” in the sunlight.

At the same time, the colour-stable glass provides permanent visual protection inside without compromising the supply of daylight. In conjunction with the new façade insulation, the symbiosis of sound and image set in glass also contributes to a better energy balance and, finally, ensures that pupils feel comfortable – whether they are learning or doing sports.

The new façade effectively recreates the orthogonal grid of the building designed on the basis of the CROCS system. Photo: Corinne Cuendet / Chiché Architectes
The new façade effectively recreates the orthogonal grid of the building designed on the basis of the CROCS system.
Photo: Corinne Cuendet / Chiché Architectes
The “piezo” metal discs integrated in the SWISSLAMEX Colordesign laminated safety glass by Glas Trösch produce the image of a stylised wave. As vibrating sound bodies, they generate the sound of flowing water.  Photo: Claudine Garcia & Marcel Kultscher
The “piezo” metal discs integrated in the SWISSLAMEX Colordesign laminated safety glass by Glas Trösch produce the image of a stylised wave. As vibrating sound bodies, they generate the sound of flowing water.
Photo: Claudine Garcia & Marcel Kultscher

 

Building board:

Project: EPCL vocational school / Ecole professionnelle commerciale Lausanne

Site: Lausanne, Vallée de la Jeunesse, Switzerland

Completion: 2014 (school building), 2019 (sports hall)

Client: Canton of Vaud (CH), Lausanne (school building), City of Lausanne (sports hall)

Architect: Chiché Architectes SA, Lausanne, http://www.chiche.ch

Façade Engineering: Progin SA Métal, Bulle, http://www.progin.ch

Artist: Rudy Decelière, Geneva, http://www.rudydeceliere.net

Manufacturer of laminated safety glass: Glas Trösch AG, insulation and safety glass, Bützberg

Products: SWISSLAMEX Colordesign “Y”

600450 Resonant façade by Glas Trösch glassonweb.com

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