Soka-Bau Green Roof Case Study - SCHL

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4 Courtyards Nestled one level below the boxwood bands are the courtyards, which can be viewed from above or from adjacent meeting rooms. The design consists of colourful gravel paths, a few taller plants, such as Kousa dogwood among interspersed ferns and other woodland plants, and stacked limestone sculptures. Terrace Source: Landeshauptstadt Wiesbaden Figure 6: Aerial photograph showing the distinctive structure of the roof gardens On the same level as the courtyards there are terraces to the east and the west edges of the concourse. The western terraces are wider and a little sunnier than the eastern terraces. Curved metal bands separate fine gravel surfaces of different colours. Boxwood hedges planted along the curves gradually slope upwards as if they were bending towards the light. As with the swirling boxwood bands, these hedges help to buffer the wind that travels from the southwest towards the northeast. The form is different because the wind is gentler in this location. The gravel surfaces are sparsely planted with bulbs and other low-growing species that come and go with the seasons. The shaded areas contain shade-tolerant species such as geranium. The western terrace, next to the cafeteria, is an outdoor dining patio and is partially covered in stone slabs matching the typical curves.
Other types of greening Groves and hedges The tree groves to the east are planted above the underground parking and the groves to the west partially cover the water cisterns. The growing medium is 1 to 1.2 m (3.2 to 3.9 ft.) deep. Each area between the office blocks is planted with a grove of fine-leaved trees (Gleditsia, Robinia or Crataegus), which provide summer shade while still letting in natural light. The meadow mix contains grasses, clover, squill and iris. The privet hedges adjacent to the west side of the main concourse are planted in curving rows that are an extension of the boxwood hedges on the terraces above. Both the grove and hedge elements are intended to buffer the prevailing southwest winds and cool the western facades. Light courts The light courts are at the lowest level and provide natural light to the underground offices and natural ventilation to the underground parking. Vines that wind around wire cables are planted along the parking structure as a green facade. They are intended to partially shield the view of parked cars from the office windows opposite. Vine growth will be restricted so that it does not block natural ventilation for the open parking structure. The light courts are a challenging environment for plant growth as they are in full shade, vulnerable to cold drafts and, because of the overhanging structures, do not get as much precipitation. The designers used vertical elements, such as columnar oaks and vines and limestone sculptures on yellow-white gravel, to lighten the space. Fog irrigation brings the necessary humidity. The light courts have a primordial quality with the limestone sculptures reminiscent of dinosaur fossils set amid ferns, vines and fog. Technical aspects Growing media The extensive green roofs are built using the single-layer construction method, in which the drainage layer and growing medium are combined (see Figure 4). The resulting growing medium has a relatively high pore volume that supports rapid drainage. 5
Page 1 and 2: i nnovative buildings Soka-Bau Gree
Page 3: The design consists of gentle furro
Page 7 and 8: Irrigation All the roofs have drain
Page 9 and 10: components had to be completely rem

Soka-Bau Green Roof Case Study - SCHL

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