GreenPlusSchool@urban - Highly efficient facade and roof greening in combination with PV; optimal solution for energy efficiency in overall environmental consideration

In this project, different building-greening systems and plant/substrate types, combined with various PV modules, will be examined on a Viennese school. The influence on the hygrothermal behaviour of the building, energy-saving potential, humidity, shading, noise reduction, water retention and heat island effect are going to be scientifically explained. The students of the school will also be involved.

Short Description





The climate change is a scientifically proven fact. One of the main reasons is the rising of the greenhouse gas CO2 in the atmosphere. Therefore, the use of fossil fuels should be minimized for the production of building materials, the energy consumption during the construction or renovation process as well as the energy supply for the building operation. The big cities are currently responsible for 80 % of the global CO2 emissions with their high accumulation of buildings and their building materials. The global forecasts say that in 2050 two-thirds of all people will live in cities. Thus, one needs multi-functional system-solutions in order to maintain the quality of life in the cities of the future. With these solutions one should be able to gain energy; to save heating and cooling energy, to bind dust and to increase air quality. In addition noise should be reduced and heat-islands, CO2 capturing and floods must be tackled.

Contents and goals

All previous studies of the building greening refer to a specific situation, a particular system, a maximum attained growth stage, etc. They were carried out for new buildings or for test houses. In this research project, building greening will be investigated with regard to many aspects.


The test object is an old building in an asphaltic / paved area (school GRG 7) in the metropolitan area of Vienna. There is the opportunity to visit the experimental fields of the building and the usage future residents (students) can be integrated. The building suitably represents the older parts of the metropolitan area of Vienna. Different experimental areas with measuring equipment will be built at the object. Several greening systems / substrates / plants that are available on the market without and in combination with photovoltaic as well as various combinations, regardless of market vendors will be used. Their effects on the hygrothermal behavior of the building, the energy gain, the energy saving, the sound insulation and room acoustics will be critically investigated. In addition, the microclimate and the summer overheating will be analyzed.

Then all systems and combinations will be ecologically rated (there will be a calculation tool) and the cost-benefit ratio will be calculated. An efficient and cost-saving solution should be found out of a wide range of available plant diversity and photovoltaic modules (opaque and semi-transparent) which is arbitrarily multipliable and can be used for the improvement of existing buildings. The target is to achieve correct energy efficiency and to minimize the "gray energy".

Expected Results

The best (energetic, environmentally and economically) combinations of the multifunctional systems could be used for future building renovations and new buildings.

Thus, it will be possible to reach a correct decision for building projects in the "City of the Future". The results will be provided in the form of a catalog of measures / guidelines and on a public project homepage. They can be used for example by companies for further development (services and products) or innovation projects. The detailed and deep-laying tests and results will also be presented for publication in scientific high-level SCI journals and at conferences.

Project Partners

Project management

Prof. Dipl.-Ing. Dr. techn. Azra Korjenic, Institute for Building Construction and Technology, Research Centre of Building Physics and Sound Protection, Vienna University of Technology, Austria

Project & cooperation partners

  • Universität für Bodenkultur Wien (BOKU), Institut f. Ingenieurbiologie und Landschaftsbau, Fachbereich Vegetationstechnik (IBLB)

    • O. Univ. Prof. Dr. Florin FLORINETH Departmentleitung, Institutsleitung
    • Univ. DIin Ulrike PITHA stellv. Institutsleiterin
  • ATB - Becker e.U.,Ing. DI (FH) Gernot Becker
  • Kräftner Landschaftsarchitektur, Dipl. Ing. Joachim Kräftner

Contact Address

University of Technology Vienna
Institute of Building Construction and Technology
Karlsplatz 13/206-2
A-1040 Wien
Tel.: +43 (1) 58801 - 20662
Fax: +43 (1) 58801 - 920662
Web: The Project on the website of the University of Technology Vienna