{"id":303,"date":"2023-09-12T16:21:39","date_gmt":"2023-09-12T14:21:39","guid":{"rendered":"https:\/\/circularmaterialsystems.com\/?post_type=case&p=303"},"modified":"2024-07-08T21:50:56","modified_gmt":"2024-07-08T19:50:56","slug":"01_en_bombasei-areal","status":"publish","type":"case","link":"https:\/\/circularmaterialsystems.com\/en\/case\/01_en_bombasei-areal\/","title":{"rendered":"Bombasei Areal"},"content":{"rendered":"\n

General description<\/h3>\n\n\n\n

The project is the first straw bale settlement in Switzerland, situated at the old factory site of Bombasei in Nanikon, a small village east of Zurich. The development consists of three independent buildings with a total of 28 residential units of various sizes. Different types of flats, from one-room studios to multi-storey terraced houses with five and a half rooms were created. The mix of apartments offers attractive living spaces for young families, couples, senior citizens, and individuals.<\/p>\n\n\n\n

\n
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\u00a9 by Lorenz Sedlmayr & Pascal M\u00fcller<\/figcaption><\/figure>\n\n\n\n
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\u00a9 by Georg Hubmann<\/figcaption><\/figure>\n\n\n\n
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\u00a9 by Georg Hubmann<\/figcaption><\/figure>\n\n\n\n
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\u00a9 by Damien Poffet<\/figcaption><\/figure>\n\n\n\n
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\u00a9 by Georg Hubmann<\/figcaption><\/figure>\n\n\n\n
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\u00a9 by Georg Hubmann<\/figcaption><\/figure>\n<\/figure>\n\n\n\n

Introduction to Circularity<\/h3>\n\n\n\n

From the outset, the architects wanted to create a sustainable and environmentally friendly project. The energy necessary for producing the components of the building, the energy consumption of the building during operation, and the potential reuse of the building materials in the distant future were the key design parameters. The process of construction was reduced to a minimum through the prefabrication of modules. The timber frame construction was filled with straw as insulation material and plastered with lime before being transported to the site. The 90cm thick exterior walls have the potential to significantly reduce energy costs while protecting the inhabitants from the summer heat. One downside of the project was the demolition of an existing building on site.<\/p>\n\n\n\n

\n
\"\"
\u00a9 by Lorenz Sedlmayr & Pascal M\u00fcller<\/figcaption><\/figure>\n\n\n\n
\"\"
\u00a9 by Lorenz Sedlmayr & Pascal M\u00fcller<\/figcaption><\/figure>\n<\/figure>\n\n\n
\n \t
\n\t\t\t

Practices<\/h3>\n\t\t\t

Unlike other building materials, straw has no lobby.<\/span><\/i><\/p><\/blockquote>\n

Paul Schmidt, Architect<\/strong><\/p>\n\t\t<\/div>\n\t\t

\n\t\t\t
\n\t\t\t
\n\t\t\t
\n\t \t\t\t\t
\n \tDesigning for modularity<\/span><\/a>\n\t\t \t

The entire settlement consists of 68 prefabricated wooden modules filled with straw bales. A total of 420 tons of straw was used. The timber frame construction was built as modules that were assembled by Zaugg-Rohrbach AG and then filled with dried and pressed straw. The assembly of the prefabricated wooden modules only took four weeks.<\/p>\n\t\t \t<\/span>\n\t\t \t\n\t\t\t\t<\/div>\n\t <\/div>\n\t <\/div>\n\t\t\t

\n\t\t\t
\n\t \t\t\t\t
\n \tDesigning low tech<\/span><\/a>\n\t\t \t

Compared to conventional buildings, only few materials were used in this project. The wood-straw modules make Bombasei an example of technically simple construction and straightforward design. Additionally, the heavy insulation reduces the building equipment for heating and cooling to a minimum. <\/p>\n\t\t \t<\/span>\n\t\t \t\n\t\t\t\t<\/div>\n\t <\/div>\n\t <\/div>\n\t\t\t

\n\t\t\t
\n\t \t\t\t\t
\n \tDesigning with passive strategies<\/span><\/a>\n\t\t \t

In an interview, architect Paul Schmidt explains that the walls follow the metaphor of a sleeping bag. Why does a room need heating to make it inhabitable? By introducing 90 cm thick exterior walls insulated with straw, no heat is lost from the building and also there is a cooling factor in summer. \u201cSo far we don\u2019t know whether it is profitable or not. But if heating costs increase in 10-20 years, it will definitely be worth it\u201d said Schmidt. Moreover, the energy produced by the PV system on the roof can possibly heat the entire building without purchased energy, even in winter.<\/p>\n\t\t \t<\/span>\n\t\t \t\n\t\t\t\t<\/div>\n\t <\/div>\n\t <\/div>\n\t\t\t

\n\t\t\t
\n\t \t\t\t\t
\n \tLobbying for materials<\/span><\/a>\n\t\t \t

When building with straw, it is necessary to have contacts to local construction companies that, on their side, have contacts to farmers who sell their straw to them. This local value chain can work and should be promoted, but this would not increase the competitiveness of the building material or its establishment on the market. It is not about creating a central market, it is about defining the sources, connecting them, and increasing transparency. There must be representatives and quality management advisors, as well as designers who promote straw as a feasible alternative to other building materials. <\/p>\n\t\t \t<\/span>\n\t\t \t\n\t\t\t\t<\/div>\n\t <\/div>\n\t <\/div>\n\t\t\t

\n\t\t\t
\n\t \t\t\t\t
\n \tUsing natural materials<\/span><\/a>\n\t\t \t

The low-cost straw is an ideal insulating material due to its low thermal conductivity. It also contributes to a good indoor climate. Compared to conventional building materials, some of which are produced in very complex processes, straw bales contain much less grey energy. “Straw accumulates during grain cultivation anyway,” explains Paul Schmidt. “By using it as a building material, we are putting an agricultural byproduct in use”. A lime plaster protects the straw panels from moisture and provides fire-resistance.<\/p>\n\t\t \t<\/span>\n\t\t \t\n\t\t\t\t<\/div>\n\t <\/div>\n\t <\/div>\n\t\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n \n\n\n

Material inventory and supply chains<\/h3>\n\n\n\n

Most of the raw materials were extracted at a distance of more than 100 kilometres away from the project site. Aggregates like gravel, which was used for the concrete elements, were extracted in pits in Germany. Straw for the insulation came from the region Besancon (France), outside Switzerland. The spruce for the timber framework came mostly from Slovakia, more than 500 km away from the project site. Further processing steps were predominantly done in closer proximity to the project site (except for the CLT).<\/p>\n\n\n\n

\n
\"\"
\u00a9 by Lorenz Sedlmayr & Pascal M\u00fcller<\/figcaption><\/figure>\n\n\n\n
\"\"
\u00a9 by Lorenz Sedlmayr & Pascal M\u00fcller<\/figcaption><\/figure>\n\n\n\n
\"\"
\u00a9 by Lorenz Sedlmayr & Pascal M\u00fcller<\/figcaption><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"

General description The project is the first straw bale settlement in Switzerland, situated at the old factory site of Bombasei in Nanikon, a small village east of Zurich. The development consists of three independent buildings with a total of 28 residential units of various sizes. 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