The multi-family house built in 1877 in Zurich with stone and brick walls is located in a district that was built between 1873 and 1889 and which is classified as valuable for urban planning and monument care. The goal of the renovation in 2010 was the reduction of the energy consumption of the building and its CO2-neutral operation while preserving its external appearance. This would not have been possible with a conventional façade insulation.
While the roof and basement ceiling were insulated conventionally with mineral wool, the outer walls were equipped with 20 mm EPS on the inside and with two 10 mm Spaceloft blankets on the outside. The blankets were glued and additionally fastened with dowels, which also fix a mesh for the render. With these measures, the u-value of the walls were reduced from about 1.9 W/(m²·K) (calculated) down to 0.40 W/(m²·K) (measured). Thereby the u-value meets the requirements for renovations of the SIA 380/1 standard. The scientific support of the regeneration project was supported by the Swiss Federal Office of Energy (SFOE).
Wenger, Martin, Karim Ghazi Wakili, Bruno Binder and Christoph Tanner. 2012. “Renewal of Fichtenstrasse 14, Zürich.” Final report. Zürich: Swiss Federal Office of Energy SFOE.
Ghazi Wakili, K., B. Binder, M. Zimmermann and Ch. Tanner. 2014. “Efficiency Verification of a Combination of High Performance and Conventional Insulation Layers in Retrofitting a 130-Year Old Building.” Energy and Buildings 82: 237–42. doi:10.1016/j.enbuild.2014.06.050.