Reconstruction ecological Freihof Sulz

integral reconstruction of the valuable cultural heritage "Freihof Sulz" to a communication- and action centre; Demonstration project for local culture and life quality, old building techniques, energy saving and ecological reconstruction."

Content Description




Directly comparing the OI3-BGF reconstruction to options for a new building, reconstruction should clearly be prioritized from ecological viewpoints.

The preservation of ancient monuments and ecological reconstruction perfectly complement one another. The basic idea is to conserve the stock and use original material as well as old building techniques, which mostly is energy saving and ecologically feasible, too.

Environmental-friendly and sustainable reconstruction does not just begin with the use of environmental- and resource-friendly building materials, but already with demand evaluation, conception and planning of building projects.

Industrial establishments belong to the large Austrian building contractors. Orienting the industrial world of construction towards ecological and sustainable criteria will first of all have a direct impact on ecologization of building projects in Austria. By means of organized networks and through cooperation between municipalities and company networks on regional and federal level there can be a targeted exchange of information and experiences. In this process, the use of well-upgraded planning instruments for ecological evaluation and optimization of building constructions ("energetic reconstruction in preservation areas" and ÖBOX) is essential for municipalities as well as for economy at large.

The Freihof Sulz, a former country guest house in the municipality of Sulz (Austria), should not only be preserved as a cultural heritage, but also become a lively meeting point again. The motto is "one can learn from old buildings". Through successful and coherent demonstration projects, the benefits and importance of sustainable building techniques become tangible and understandable to citizens.

Thanks to the energy saving reconstruction, the use of industrial energy could be reduced. The calculated heating demand HWB of 29.46 kWh/m²a has been reached. The required industrial energy is supplied through biomass contracting heating, a solar plant, and an oven. Furthermore, heat recovery of the ventilation system and the refrigeration units reduce energy consumption.

The used building materials are mainly renewable raw materials, with the clear aim of using materials available in the region. Old techniques and ecological materials were strongly focused on. Moreover, old building techniques and materials were developed into modern, future-oriented clay building techniques and were realized in a test run for prototypes (in view of: acoustic insulation, regulated room climate/humidity, thermal insulation, low maintenance effort, color scheme and surface feel, seal, reinforcement layers).

Of course, the concept of resource-friendliness did not apply to the whole construction project and to new buildings. In order to reach an ecological optimum in this field, an additional ecological and building biological specialized planning was part and parcel of planning and realizing the project. The fact that this extensive optimization and planning principle is fit-to-use shall incite further municipalities as well as industrial and private building contractors alike to take a step forward on this path. Through the BOT project, the findings about the efficiency of the used planning instruments were directly integrated into their upgrade process.

The reconstruction project was a solid building. Static construction and conversion were separated, which ensures an easy and flexible adaptation to changing future demands. The used building materials from renewable raw materials can be recycled (e.g. construction lumbers, sheep wool, etc.) or be reasonably disposed (e.g. composting, use as energy source).

The principle of a resource-friendly use of building materials and the promotion of domestic renewable raw materials form the basis of a sustainable economic policy supporting the regional added value. The economic location will be strengthened, employment in the (rural) region will be secured, and therefore an essential aspect for the quality of life will be sustainably guaranteed.

Project Partners

Project manager

Lydia Zettler Madlener, Freihof Sulz
Dipl. Ing. Beate Nadler-Kopf, Architekturbüro DI Beate Nadler-Kopf, Hohenems


Dipl.-Ing. Dr. techn. Andrea Sonderegger, Energieeffizienz - Architektur


  • Gebhard Bertsch, Ökoberatung Gebhard Bertsch
  • Dr. Karl Torghele, Spektrum GMBH
  • Mag. Martin Rauch, Lehm Ton Erde Martin Rauch Werkstätte für Keramik + Lehmbau
  • Alexandra Ortler, Energie Tirol
  • BM Harald Gmeiner, Energieinstitut Vorarlberg


Project manager: Lydia Zettler Madlener
Adresse: Unterberg 4, 6832 Dafins
Tel/Fax: +43 (5522) 45843