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B. Sommer, U. Pont, P. Bauer, G. Moncayo, Jakob Braun, M. Sommer-Nawara, I. Prieler, F. Riola Parada, T. Brus, D. Minovski, M. Wölzl:
"New approaches towards reductive thermal insulation of Gründerzeit facades via autonomous robots";
Vortrag: Conference on Cultural Heritage and New Technologies CHNT26, Wien / Rathaus; 02.11.2021 - 04.11.2021; in: "Proceedings for CHNT26", ICOMOS Austria (Hrg.); Eigenverlag ICOMOS, (2021).

no german abstract:
It is common knowledge that the reduction of building-related emissions and energy use require a considerable performance improvement of the existing building stock. However, given the cultural meaningfulness of traditional buildings and their facades in most of the major European Cities, thermal retrofit has to be conducted not only based on energy-related interests, but rather also un-der consideration of upkeep of aesthetics and history of these buildings. New and innovative tech-nologies for retrofit are required. This is due to the fact that common thermal retrofit is done by add-ing thermal insulation either on the outer or inner perimeter of the building envelope, which regularly is connected with a set of issues. The former variant is often in conflict with articulated and orna-mented historic facades unless specific, in cost-intensive technologies as Aerogel-Plasters are used (compare Schuss et al. 2017). The latter comes with increased condensation risk, which is prob-lematic in both short-term and long-term perspective. Condensation and connected mould growth can be considered as negative for the hygienic conditions in buildings during cold season already in a short-term perspective. On the long-run deterioration of load-bearing trusses can occur, leading eventually to critical devastation of the historic building envelope. Furthermore, the application of in-sulation panels on the inside can lead to a considerable loss of useable gross area. This contribution reports on a disruptive different approach toward increased thermal insulation of existing building envelopes, which has been explored in an exploratory study conducted from 2019 to 2021. The basic idea of this thermal improvement is based on subtraction of material from existing walls in Gründerzeit buildings, which is possible from the perspective of structural engineering without en-dangering the stability of these walls. Moreover, autonomous robots that use digital technologies and knowledge about the corresponding façades shall conduct the insulation efforts. We shortly ex-plain our approach, the behind-lying concepts from structural engineering and building physics, and illustrate the approach in its principle. It has to be considered by the reader that this is early-stage research, and thus shall not considered as technology to be applied ad hoc from tomorrow on-wards. Rather, the contribution wants to present the concept to the audience of the CHNT26.

It is common knowledge that the reduction of building-related emissions and energy use require a considerable performance improvement of the existing building stock. However, given the cultural meaningfulness of traditional buildings and their facades in most of the major European Cities, thermal retrofit has to be conducted not only based on energy-related interests, but rather also un-der consideration of upkeep of aesthetics and history of these buildings. New and innovative tech-nologies for retrofit are required. This is due to the fact that common thermal retrofit is done by add-ing thermal insulation either on the outer or inner perimeter of the building envelope, which regularly is connected with a set of issues. The former variant is often in conflict with articulated and orna-mented historic facades unless specific, in cost-intensive technologies as Aerogel-Plasters are used (compare Schuss et al. 2017). The latter comes with increased condensation risk, which is prob-lematic in both short-term and long-term perspective. Condensation and connected mould growth can be considered as negative for the hygienic conditions in buildings during cold season already in a short-term perspective. On the long-run deterioration of load-bearing trusses can occur, leading eventually to critical devastation of the historic building envelope. Furthermore, the application of in-sulation panels on the inside can lead to a considerable loss of useable gross area. This contribution reports on a disruptive different approach toward increased thermal insulation of existing building envelopes, which has been explored in an exploratory study conducted from 2019 to 2021. The basic idea of this thermal improvement is based on subtraction of material from existing walls in Gründerzeit buildings, which is possible from the perspective of structural engineering without en-dangering the stability of these walls. Moreover, autonomous robots that use digital technologies and knowledge about the corresponding façades shall conduct the insulation efforts. We shortly ex-plain our approach, the behind-lying concepts from structural engineering and building physics, and illustrate the approach in its principle. It has to be considered by the reader that this is early-stage research, and thus shall not considered as technology to be applied ad hoc from tomorrow on-wards. Rather, the contribution wants to present the concept to the audience of the CHNT26.

Gründerzeit Facades, Thermal Retrofit, Ornaments, Robotics, subtractive refurbishment.