R-Bau - Development of a replicable deconstruction strategy for residential buildings to force the recovery-oriented dismantling
starting point / motivation
At present, the recovery-oriented dismantling plays a subordinate role within the deconstruction and renovation process of residential buildings. Currently, a flat rate is charged for the deconstruction of buildings, and the resulting construction waste materials and components are expensively deposited (around 40 to 60% of construction waste from the demolition of buildings is deposited currently). However, construction waste materials and components have a great untapped resource potential and should be reused or recycled according to the EU Waste Framework Directive.
As a prerequisite for the sustainable use of construction waste a paradigm shift in the execution of building deconstruction is necessary. The demolition must be replaced by the recovery-oriented dismantling as state of the art to ensure that buildings are analysed and evaluated before deconstruction, toxic and impurity material are identified and discharged, and an optimal reuse or recycling process of waste material is enabled.
Contents and goals
Nearly 200 cooperatives and corporations manage approximately 850,000 housing units in Austria (about a quarter of the total Austrian housing stock). The aim of the project "R-Bau" is to develop together with these stakeholders a deconstruction strategy to foster the recovery-oriented dismantling of residential buildings.
The target of the project is to provide a relevant contribution to establish the recovery-oriented dismantling together with the relevant stakeholders as state of the art for residential buildings in Austria. By the implementation of the recovery-oriented dismantling the quality of waste material in building deconstruction will be raised and the reuse of occurring waste material as certified construction material in refurbished or new buildings will be forced to reduce the deposited waste to a minimum.
The project starts with the analysis of the emergence and the disposition of construction waste and the identification of the current technical and legal barriers according to the handling of construction waste material and components. Furthermore it will be analysed which construction waste material and components can be non-destructively dismantled, reused or recycled.
The aim is to identify, evaluate and categorize construction waste components and materials which are suitable for reuse or recycling. For these analysis, standardized building models will be developed within the project. By means of these building models the dismantling ability of building materials and components will be assessed. Based on the specific materials and components, the recovery-oriented dismantling will be simulated and the life cycles of the waste material and components from deconstruction to reuse will be evaluated energetically, environmentally and economically.
Based on these analyses, a replicable deconstruction strategy for residential buildings will be developed together with relevant stakeholders (building cooperatives, construction companies, demolition companies...).
The key aspects of the project are the development of standardized building models to analyse the recovery-oriented dismantling process, the design of a deconstruction catalogue including detailed instructions for the sustainable and cost-optimal utilisation of construction waste material and components with regard to re-use and recycling, and the transfer of the project findings to refurbishment, design and erecting of residential buildings.
Moreover, possibilities to overcome the current technical and legal barriers in the handling of deconstructed waste materials and components will be identified and specific incentives for the practical implementation of the recovery-oriented dismantling will be worked out.
Austrian Energy Agency