sustainability Article Material Flows and Stocks in the Urban Building Sector: A Case Study from Vienna for the Years 1990–2015 Jakob Lederer 1,2,*, Andreas Gassner 1, Florian Keringer 3, Ursula Mollay 3, Christoph Schremmer 3 and Johann Fellner 1 1 Christian Doppler Laboratory for Anthropogenic Resources, Institute for Water Quality and Resource Management, TU Wien, Karlsplatz 13/226, 1040 Vienna, Austria;
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[email protected] (J.F.) 2 Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, Getreidemarkt 9/166-01, 1060 Vienna, Austria 3 Austrian Institute of Regional Studies (OIR GmbH), Franz-Josefs-Kai 27, 1010 Vienna, Austria;
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[email protected] (C.S.) * Correspondence:
[email protected] Received: 2 December 2019; Accepted: 27 December 2019; Published: 30 December 2019 Abstract: Population growth in cities leads to high raw material consumption and greenhouse gas emissions. In temperate climates were heating of buildings is among the major contributors to greenhouse gases, thermal insulation of buildings became a standard in recent years. Both population growth and greenhouse gas mitigation may thus have some influence on the quantity and composition of building material stock in cities. By using the case study of Vienna, this influence is evaluated by calculating the stock of major building materials (concrete, bricks, mortar, and plaster, steel, wood, glass, mineral wool, and polystyrene) between the years 1990 and 2015. The results show a growth of the material stock from 274 kt in the year 1990 to 345 kt in the year 2015, resulting in a total increase of 26%.