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Mariahilferstrasse 182 - Vienna, Austria

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Credits: @DieterHenkel

This building is declared as klimaaktiv gold and has received  Austrian State Prize for Architecture and Sustainability 2019 (Staatpreis Architektur und Nachhaltigkeit 2019).



The building consists of 29 residential units, of which 9 apartments and around 760 m² of living space are attributable to the newly developed two-storey attic floor. In the ground floor zone, around 270 m² of commercially used local space as well as a garage with 7 parking spaces with an e-charging station were converted, for which the inner courtyard on the ground floor was overbuilt. In addition to the restored façade, the exterior of the new attic storey is initially noticeable. The partial demolition of the side wings and the raising of the yard level improved the light situation in the courtyard and radiate positive to the immediate neighbourhood.




In the building, the application of high-performance insulation plaster was implemented. The high-performance insulation rendering system provides a new alternative for the field of old building renovation with well-preserved facades. The goal was the demonstration of the technical feasibility and practicality of such remediation solutions. Another project objective was the metrological monitoring of the project for the evaluation of the total renovation and the effect of the plaster. For this purpose, an energy consumption and comfort monitoring were implemented.




Along Denglergasse, on an area of around 205 m², Austria's largest airgel façade was built. Until now only tested on inner walls and smooth walls, this offered the chance to use the aggregate, which has extraordinarily good thermal insulation properties, on an articulated façade. With only five centimeters of the machine applied plaster, the effect of a 15 centimeter thick, conventional insulation board can be achieved - an excellent environmental and aesthetic option. On the Mariahilfer Straße, the façade was much more damaged. Therefore, the newly constructed outer wall was moved a bit to the inside of the building to be able to attach a hemp insulation. Destroyed facade decoration elements were refilled in cooperation with a restorer made of foam glass, because a restoration from the original material would not have been economically justifiable.


U-value (post-intervention) [W/m2K]: 0,3 W/m²K




The visible result is the successful refurbishment of a historic building where it has been possible to restore the external appearance and achieve a visually unrecognizable transition between old building and reconstruction. The high structural and design requirements were fully met and high visibility of the project achieved (mainly by winning the 33rd Vienna Urban Renewal Award of the Guild Construction). At the same time, the high demands of an energy-efficient building stock could be fulfilled, even though the metrologically determined heat transfer coefficient does not fully correspond to the calculated values. The supplementary evaluation by means of long-term monitoring takes place after the first or second year of operation.

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