Extensive Green Roof: depth 3 - 5 inches; plants: Mosses, Sedums, Succulents, Herbs and few Grasses; Low maintenance and costs

The petrol station is a result of a long-term project of MOL, called as the “The petrol station of the future”. The designers created a building with excellent thermal insulation, green walls, a green roof, solar panels, rainwater utilization and an alternative heating system. Even the interior of the building was created with as much environmentally friendly materials as possible. The building uses LED lighting only to save energy. These environmental efforts resulted in Energy savings of more than 50 percent, and the neutralization of 10 tons of CO2 gas emissions. (Reference 1)

This project was implemented on the rooftop of a ten-floor building with a floor space of 1.4 hectares, with the implementation of a green roof of 650m2. The motivation behind this was to study the thermodynamic impact of a green roof in hot Athens. Results concluded that the greenroof significantly affected the thermal performance of the building. Energy savings of 50% were observed for air conditioning on the floor directly below the installation. In addition to the energy-saving benefits, the study also found increased biodiversity in the area. A plethora of birds and beneficial insects were observed on the roof, ranging from robin redbreasts, yellowhammers, yellow tits, coal tits, and sparrows to kestrels hovering high above eyeing up the smaller birds. Other species such as honey bees, tiger swallowtail, monarch butterflies, dragonflies and ladybugs were also seen (Ref 1). The study suggested in improved micro-climate and biodiversity of the constitution square (Ref 1, 6, 7).

Metrodom Panorama is a private investment containing four 17-storey residential buildings. Following the model of Bosco Verticale of Milan, the facades of the buildings will be created as vertical forests. In the balconies of the buildings 3 to 6 meter high trees are planned to be planted. The construction was finished and the buildings were opened for residents in 2020. As the building is still very new, the green elements of the building are not fully grown in their size, but in 3-4 years the buildings of Metrodom Panorama will be covered with especially lush vegetation. (Reference 9)

This NBS site is part of the Bratislava Zelenaj Project. This particular NBS involves the creation of vegetation on buildings as a means to mitigate the effects of climate change in cities due to urban overheating caused by global warming. It targets the residents of the Archa House of Seniors (Domove seniorov Archa) in Bratislava as part of the citywide project “Bratislava is preparing for climate change” with the aim of protecting and promoting the welfare of the city’s vulnerable citizens from climate change effects. The roof's main function is buffering the discharge of excess rainwater. (10)

The area was planned to be the Öresund Region's most climate-smart city district: an energy efficient, resource-saving and green district with a hundred percent renewable energy use.” (ref. 2). The area's development program focused on the ecological aspect of sustainability and took responsibility for that part of the city's sustainability work (ref. 7).

Bastion Theresia Timisoara was built as a defensive perimeter for the Romanian town of Timisoara and has languished for decades in the center of the city. The bastion was rehabilitated and it incorporates green spaces and a community center. The old fortress' location in the middle of town makes it a natural hub for transportation and assembly, and the extensive green roof incorporates it into the city's urban green belt. (1)

This underground garage in Alicante, Spain, received a green roof makeover according to Alicante's climatological conditions (Ref. 2). Urbanarbolismo, a Spanish firm with a strong focus on vegetation, designed and installed this succulent garden in the courtyard of the garage. The garden is very low-maintenance and doesn't require any irrigation whatsoever. Further, with every passing year, it will grow more and more beautiful as the plants grow larger and take root. The Urbanarbolismo Benisaudet IVVSA parking garage was created by this Spanish design firm with the purpose of "keep[ing] the underground lot cooler, as well as improv[ing] its air quality." (Ref. 1)

The main aim of this program is to address the lack of green roofs across South Yorkshire. Greening bus shelter's roofs is indeed an innovative idea, as it provides an attractive green space in urban streets and also offer much-needed shade for waiting passengers. The living vegetation installed on the bus shelter will filter pollution and particulates from transport exhaust; will, in turn, reduce the pollution - protect passengers health. Greening of the bus shelters highlights the value of integrating sustainable design and green travel in attempts to reduce rates of climate change. (ref 1) Each bus shelter roof is 6sq m in size and all over the city, there are several such green roof bus shelters (ref 1).

This project was the first green roof in the city of Bologna, and it has been carried out by the University of Bologna in collaboration with the Columbia University of New York with the aim to prove more evidence on green roof stormwater performance. For the Engineering School of Bologna University the existing roofs had a load capacity that was able to host only an extensive roof, without the costly need of being reinforced. In the extensive roof type the vegetation is usually very drought resistant and plants can adapt to difficult environmental conditions, therefore sedum was chosen (1).

Via Gandusio is a social housing complex in the North of Bologna that was originally built for hosting workers that migrate from South Italy in the 60s. Nowadays, it hosts two different communities: advanced-age Italians and current international immigrants. The differences create some conflicts and limits relationships among the community. In 2010 a group of researchers tried to implement a community garden that was designed with the aim of setting a meeting point for the community where food production is the link between neighbours to exchange knowledge, culture and experiences. The 250 m2 roof garden started in 2011 becoming the first of the city of Bologna and of Italy (Ref. 7 and 8).
Over the years the project has undergone changes and variations, has seen the end of funding and known voluntary management (2013). Since 2013 there is an urban vegetable garden cared for by some residents with the support of the Biodiversity association. (Ref.10)