Retrofit versus New Construction; A Life-Cycle-Assessment (LCA) Case Study of Single Family Houses in Lower Austria

Tanja Schmidt, Ulrich Pont, Ardeshir Mahdavi
Buildings are a major contributor to greenhouse gases and energy consumption. In order to determine how ecological a building or building material really is, its entire life cycle must be considered. A life cycle assessment can help to show improvements in the environmental properties of products in the various phases of their life-cycle.(Facheinschlägige Normung) Many research studies deal with new constructions and very efficient buildings. The potentials of existing buildings are mostly
more » ... ngs are mostly neglected. Potentials include, among other things, that existing buildings already have a building substance and that this often only has to be reused, adapted or renovated, while new buildings usually are built on unsealed areas. This has a positive impact on global warming.However, one is often faced with the question of how to proceed with an existing building. Therefore, this master ́s thesis deals with the question of whether various renovation options are preferable to a new building from an ecological point of view, based on two existing and one yet-to-be-built case study buildings in Langenlois, Lower Austria.The objective of this study is to gain insights into the performance of different strategies regarding building retrofit in comparison to the performance of a newly-built building. Thereby, different retrofit measures are virtually applied to the two existing buildings. Performance indicators that have been derived from these efforts include heating demand and environmental footprint. The results of each case study building are then compared and analyzed. In order to arrive at a result of the research question posed, the various renovation scenarios are compared with the new building as follows: The fictitious new building will be built in 2020. The retrofit measures of the existing buildings will also be carried out in 2020. From this point in time, a service life of 50 years is expected.This study majorly focusses on the material-related environmental footprint. Operational energy demand of the buildings is consi [...]
doi:10.34726/hss.2020.74209 fatcat:6bsijlijfjao7plvlnvivewd74