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

Situated on an area of 52 acres, Father Collins Park incorporates many sustainability-focused features and has won a number of awards. Over 1200 trees and 2000 native saplings were planted to help integrate the existing woodland, maximise biodiversity, and vastly increase the ecological value of the park. Also, wetland areas were created to filter and clean the water in the park as part of a recycling system that replenishes and helps clean the lake and water features. The wetland areas mimic the characteristics of natural wetlands and create a special ecosystem that encourages greater biodiversity in the park. (Ref. 1)

Kuninkaantammi is a new energy- and eco-efficient residential district by the Vantaa River and Helsinki’s Central Park that is in the construction phase with a dense urban design, consistent with the ecological, experiential and community requirements of modern housing. It will become a climate-smart neighbourhood for 5,000 inhabitants. Environmental factors have already been noted in the zoning of the area, and energy efficiency guides the design and building processes.
Kuninkaantammi will be a pilot project for stormwater runoff management in Helsinki using green infrastructure. The construction is ongoing (2013-2025). Management of storm waters in the area will be carried out through natural methods (ref. 1, 11).

In 2014, students, instructors and representatives of an appropriate company built a "small green roof" on the balcony above the entrance to the Department of Architecture at the Bialystok University of Technology. The initiative was a part of the "Green City by nature" project - a nationwide educational campaign about nature-based urban solutions. It took only 5 hours to unfold the roll of grass and prepare the ground for all year thuja and vines [1,2].

On 'De Roma', an old cinema that has been renovated into a theatre, a green roof of 650m2 was created which improves biodiversity and contributes to Antwerp's climate change adaptation (Ref. 1, 4). A bee house was also later installed on the roof (Ref. 2). The green roof is created by volunteers of De Roma and Kopspel, which is an organization that provides learning-working places for student of 'Deeltijds beroepssecundair onderwijs (Part-time Secondary Professional Education) and temporary employment for people that want to turn back to the labour market (Ref. 1).

The new sports campus that has recently been opened in The Hague contains multiple NBS solutions including one of the largest green roofs in the area, permeable paving of parking spots, a creek and trees that can stormwater storage. The building of the sports campus on which the green roof is created is completely CO2 neutral as it runs on solar and geothermal energy. (1,2,5,6,7,8).

A 5256 m2 extensive green roof was installed to the Washington School in Sunderland as part of the environmental standard set by the local government’s “Building Schools for the Future” (BSF) programme. Besides being a learning tool and being aesthetically pleasing, the roof provides a habitat, helps reduce ambient temperatures, assist in rainwater management and air filtering. The Hetton Lyons Primary school intervention is also part of this city-wide project (Ref 1).

The scheme of the single storey extension building ‘the Irene Kennedy Centre’ (Wirral Churches’ Ark Project, known as, Wirral Ark; a registered charity) includes a sedum roof which provides a more pleasant outlook from the existing upper floor bedrooms, whilst also maximizing environmental potential. (Ref. 1)

JDS Architects Designed a Geometric Green-Roofed Youth Center for Lille, France. Organized around a massive courtyard, the three sections of the triangle building each feature a roof that serves as an integral part of its sustainability. The kindergarten roof was planned to be a vegetated garden area with a grassy play surface that helps cool the building. (Ref 1)

The flower meadow was established in 2017 on the roof of Karcher company’s building in Kraków. It is a multiannual project. The meadow consists of herbs and flowers and it serves multiple purposes; provides the recreational space for workers, supports biodiversity and provides habitat for insects and birds, especially pollinators, and has aesthetic functions as it is composed of diverse multi-colour flowers which bloom in different seasons [1].

The office building of the Nord/LB Bank that was built in 2002 became a landmark of Hannover. A huge proportion of the building is naturally ventilated. The interior is designed with progressive energy concept with superstructure exposed and windows that provide ventilation. The building is also protected from noise and vehicle emissions through the areas of double façade, which also serves as a duct transferring clean air from the central courtyard to the individual offices. The reflection of daylight is increased through the large areas of water in the courtyard which also contributes towards a beneficial microclimate. The building is also equipped with generous roof gardens which not only provides aesthetic benefits but also improves the general climate for the occupants, and collects rainwater for irrigation and use within the building.
The building is owned by Norddeutshce Landesbank and was designed by BEHNISCH, BEHNISCH & PARTNER (Reference 2).