Development of a building passport and cadastre concept for the rationalized identification of material stocks and flows in order to optimize recycling.
Most of the anthropogenic material stock is located in the built environment. This is especially true for non-metallic minerals. In Germany, this material stock is growing and changing in its composition. In the future, the quantities of outgoing building materials will increase significantly. The construction sector therefore has a special responsibility to recycle materials, thereby conserving raw materials and at the same time making a contribution to climate protection. This requires joint efforts by all those who can influence these material flows - from the investor and owner of the individual building to those responsible for waste management, the waste and building materials industry and stakeholders with responsibility for sustainability-oriented cross-sectional tasks. So far, a lack of information has hindered the effective implementation of the concept of circular economy in the construction industry.
The provided information is all the more effective the more precisely it serves the actual information needs of actors. The aim of the project is therefore to develop and test concepts for two instruments for documenting material flows and material stocks: (1) material inventories for individual buildings and (2) material cadastres for building stocks of regions. From this, a dual approach will be developed that addresses different levels of action. Based on common principles, the concepts for the instruments will be designed and substantiated with the help of case studies.
The results provide differentiated concepts for the creation of material inventories and material cadastres. Each of these has specific strengths that contribute to the overall support of the closed loop concept in planning and construction. By combining the two into a holistic concept for an information management system, further potential can be unlocked. Material inventories supplement the empirical information base of material cadastres, thus fundamentally expanding their significance and applicability. The application of regional material cadastres to cope with tasks of society as a whole contributes to a stronger social perception of the importance of buildings as demanders of materials as well as material stocks and their support for securing raw materials.
There are currently favorable conditions for the introduction and increased use of material inventories and material cadastres. In the context of topics such as resource efficiency and the circular economy, there is growing interest among politicians, business people and planners in information on the materials used in buildings and the natural resources they consume, as well as in information on the expected material output when replacing building components and dismantling buildings. The presented concepts provide a framework to serve and further increase this interest in terms of strengthening resource and climate protection.