54 Biodiversit y and designing outdoor spaces In Poland, Blum has launched a flagship project for energy -efficient commercial construction. The focal point of this project is the innovative design of the green roof. Jasin k. Swar zędza is a suburb of the cit y of Poznań, which has over 500,000 inhabitants. In 2021, Blum built a new office and exhibition building there with a focus on energy efficiency, featuring façade heating, automatically controlled blinds and constant monitoring of the building ’s internal parameters. The building also has a water meter for meteorological analysis and is covered by a 1580 m2 “green roof ”. The green roof area absorbs almost 2000 kg of CO2, supplies its own irrigation system and promotes additional biodiversit y across the site. At the beginning of 2022, it was obser ved that bees had set tled on the roof in large numbers and were therefore pollinating the plants. The green roof helps collect rainwater and the building ’s own irrigation system – which is switched on for the growing season from April to the end of October – in all likelihood supplies all the water needed ( up to 150 m3) . The system is switched off in winter. Ground water is also used for cooling purposes and then released back into the water cycle. This successful model will continue to be expanded in fur ther building stages until the end of 2023. The plan is to increase the pilot testing area by 9200 m2 to 10,780 m2. Once complete, the total area will be equivalent to a football field, with the ma ximum dimensions of 90 by 120 metres. This green roof project is a prime example of the environmentally - friendly and energy -efficient design of our buildings. A green roof has also been installed in plant 4 in Bregenz, as can be seen in the photo on the right. Green roofs : an example for the future 304–2, 304–3 Diagram of the water extraction process Rain Plants Rainwater tank green roof
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