THERM-opti-BALCONY-P2 - Thermal Optimized Renovation of Balconies Phase 2: In-Situ-Pilot-Station

Pre-cast cantilever balconies represent a particular problem in the case of thermal rehabilitation of buildings. With the THERM-opti-BALKON-System a solution is currently being investigated under laboratory conditions. Phase 2 aims to create an in-situ-pilot-station. The most important object of study is the long-term behavior of the THERM-opti-BALKON-System.

Short Description




Starting point / motivation

As for attaching thermal insulating a posteriori on exterior walls in the course of the thermal renovation of existing buildings, pre-cast cantilever balconies represent a particular problem.

According to the state-of-the-art, the common custom is

  • to tear down the balconies before the attachment of the thermal insulation and to reconstruct them thereafter as a self-supporting construction with posts on distinctive foundations, which is in many cases technically not feasible or aesthetically unwelcome, or
  • to preserve the existing balconies which leads to severe thermal compromises because the balconies form heat bridges through the newly mounted insulation, or
  • to just omit the balconies after the thermal restoration of the building which, however, leads to a blatant deterioration of the indoor environment quality and to a occasionally dramatic loss of value of the real estate.

Contents and goals

The ongoing project THERM-opti-BALKON studies the THERM-opti-BALKON-System under laboratory conditions. This system allows the thermally decoupled new construction of balconies on thermally rehabilitated facades with optimal practicality and cost optimized.

The project THERM-opti-BALKON-P2 (Phase 2) uses the THERM-opti-BALKON-System's current state of development and implements it on a 30-year-old building under real conditions in form of an in-situ-pilot-station.


Objects of study of this in-situ-pilot-station are

  • a building object analysis process - metrological monitoring of the existing building
  • laboratory experiments and numerical calculations on the abstracted building
  • monitoring of the long-term behavior of the system

The steady further development of the overall project THERM-opti-BALKON is ensured by applying the iterative problem-solving methodology by E. Fleischhacker (1994).

Expected results

Application of the THERM-opti-BALKON-Systems is expected to result in

  • a simple method of finding the location of the existing reinforcement
  • architectural concepts
  • knowledge about the long-term behavior of the system

Project Partners

Project management

Dipl.-Ing. Nikolaus FLEISCHHACKER, BSc.: University of Innsbruck, Institute for Structural Engineering and Material Sciences, Unit for Concrete Structures and Bridge Design

Project or cooperation partners

  • FEN Sustain Systems GmbH
  • Architekt DI Gerhard Hauser

Contact Address

Dipl.-Ing. Nikolaus FLEISCHHACKER, BSc.
TechnikerstraƟe 13
A-6020 Innsbruck
Tel.: +43 (512) 507 63306
Fax: +43 (512) 507 63399