Haus am Horn

The “Haus am Horn” was a model for residential housing during the Bauhaus movement. Yet still in good condition, a new mineral render was applied in 2013 with an authentic material.

Weimar

Germany
Weimar
Contractor
Georg Muche and the Bauhaus department of Architecture (1923)
Project Date
2013

Issues and stakes

The “Haus am Horn” was a model for residential housing during the Bauhaus movement, built for the historical Bauhaus exhibition in 1923. The single-storey building covers an area of 12.70 meters x 12.70 meters; the rooms are grouped around a main room in the centre. In an exemplary way, the building shows the essential elements of Bauhaus and was therefore proclaimed as a UNESCO world heritage site in 1996. In 1999, Wittenberg architects were entrusted to renovate the building as close as possible to its original state.

The façade was in a remarkably good condition. Despite the low roof overhang, typical for Bauhaus buildings, there was nearly no algae growth found on the surface, proof of the excellent natural moisture balance of the mineral render. Only in the splash zone at the foot of the building was some damage to the rendering visible. That was because the architects of the Bauhaus group, for design reasons decided not to create an apron. Although this has been overcome in modern construction, the conservators kept this element, in order to reflect the original condition. This meant that after a further 15 years  smaller renovations were again necessary in autumn 2013.

Achievements

Originally, a mineral render with mica particles was applied to the façade. This was produced by Terranova, a German manufacturer of building materials. The architects around Georg Muche chose a scraped render with a grain size of 1 mm to achieve a very fine structure. The smooth, bright surface emphasizes the basic cubic form. Between the first and the second renovation, the Terranova company had been taken over by Saint-Gobain Weber. The conservators did not know the original composition of the render and at first, their search for a supplier of the authentic material did not produce any results.

Coincidentally, during a private visit to the site an employee of Saint-Gobain Weber noticed a plaque, upon which Terranova was named as a former supplier. Saint-Gobain Weber then got in contact with the architect and it turned out, that the company was still able to offer the high quality render in the same composition as in 1923. Today the product is named weber.top 200.

Facts & Figures

  • Property: Haus am Horn, Am Horn 61, 99425 Weimar http://www.hausamhorn.de/
  • Type of property: Residential building, monument
  • Size: 140 m² façade
  • Client: Staatliches Bauhaus Weimar (1923); friends of the Bauhaus university Weimar (renovation)
  • Planning: Georg Muche and the Bauhaus department of Architecture (1923); Wittenberg architects, Weimar (renovation)
  • Applicant: Bauhof, Weimar
  • Completion: for the Bauhaus exhibition of 1923