Subtle renovation thanks to aerogel applications in construction

The "Stringi-Stringi" building in Livorno, originally designed by architect Ghino Venturi in 1939. Image: Serena Braccini

In the category Realized Projects, five entries were submitted: one from China, one from Italy and three from Germany. In the end, the “Stringi-Stringi” project from Livorno, Italy, came out on top. This is a renovation project for the social housing building of the same name, which was realized by the architectural firm SB Ingegneria. In order to optimize the energy efficiency of the poorly insulated building from 1939, five decisive interventions were made to the structure: The roof was fitted with a 140mm thick foam insulation and the façade was refurbished with EPS 100 graphite as well as a 50mm aerogel layer. The old gas heating system was replaced by a heat pump and a photovoltaic system was installed on the roof. Finally, the windows were replaced and sealed with a 10mm aerogel blanket. According to the architect, Serena Braccini, the use of aerogel was particularly essential for the renovation of the façade of the V-shaped building. Its flexibility allowed it to insulate the curved façade without changing its appearance.

The jury was also impressed by this use of the high-performance aerogel material: “The building by architect Ghino Venturi, which is typical of the fascist era, could be brought up to today's energy standards without compromising its visual character,” said jury member Volker Herzog, summarizing the jury's decision. In addition, the building as a whole system has been made fit for the next century.

The Andreas Schubert building at Dresden University of Technology. Image: Christian Herold

Third place on the podium went to the renovation of the Andreas Schubert building at Dresden University of Technology, carried out by IPROconsult. The faculty building, built in 1959, is a listed building and therefore had to be renovated while preserving its material structure. It consists of a load-bearing concrete frame into which thinner concrete panels and windows are integrated. As part of the renovation measures, the concrete panels were fitted with a 50mm-thick aerogel insulation and new windows were installed. These measures reduced heat loss by around 75 percent while preserving the characteristic façade.

Interior view of the Tassi Museum project. Image: Marcelo Araujo

There was great diversity among the 26 student projects submitted from various countries. The Tassi Museum project by students Amanda Sayuri Hashimoto and Guilherme Pinheiro e Silva from Brazil was awarded first place. Their concept involves completely renovating the former Hotel Tassi in Curitiba, which was extensively devastated by a fire, and transforming it into a museum. In this way, they want to do justice to both the original architecture and the history of the building. To this end, they have proposed supporting the old, partially damaged brick wall with a new wooden structure. Aerogel insulation attached to the existing façade ensures that the building can literally “breathe”, significantly improving thermal insulation without allowing moisture to form between the outer and inner walls. In addition to the façade insulation, the project provides for a roof over the inner courtyard, which consists of a 30mm-thick aerogel layer within two panes of glass. This allows daylight to enter the inner courtyard, which can be used regardless of the weather. The jury sees these two applications as the optimal use of the innovative aerogel material, whereby “a maximum of the existing building and its structure is preserved”, according to jury member Beat Kämpfen. The combination of the old brick wall, which remains visible, and the new wooden structure, which gives the façade additional stability, was particularly well received.

The awards for the three winning projects in each category, crafted by artist Peter Kolčák. Image: Empa

The Aerogel Architecture Award was initiated by Empa in 2020 and made possible in 2024 by the industry partners Agitec, Fixit, IBIH and Hasit. 26 student and 5 realized projects from various countries were submitted for the 2024 competition. A jury consisting of architects Beat Kämpfen (Switzerland), Volker Herzog (Germany) and Manfred Wehdorn (Austria), as well as aerogel expert Michael O'Connor (France), assessed the submitted projects in terms of the preservation of cultural heritage, energy efficiency and the originality of the chosen solution. However, the jury always focused in particular on the pragmatic question: To what extent does the chosen measure make sense for the project in question?

Further information on all the projects submitted can be found on this website.