Traditionnal buildings with green roofs at Norðragøta on Eysturoy, Faroe Islands Photo byErik Christensen, Porkeri
2.0 Approaches to modifying the biodiversity value of buildings and sealed surfaces in Urban Areas
2.1 Green Roofs and Walls
Green Walls can be created in a variety of ways from the use of climbing plants to actively climb up (and attach themselves) the building, specialist wall garden systems and trellising (which can be bother free standing or attached to the wall). There is little in regards to literature on green walls directly however they are often covered in literature on green walls as essentially they complete the same services in principle with the addition of green walls being used indoors although they are designed differently. There are two types of green wall- Green Facades and Living Walls. Green facades generally involve climbing plants either on the wall themselves or attached to special screens/trellising. Whereas living walls are more complex structures that involve vegetated panels being attached to a wall usually in blocks and due to their vertical nature are watered from the top either by hand or through irrigation systems, when built indoors these can improve the air flow and quality within a building (Woodruff 2009). Dunnet and Kingsbury (2004) describe modular wall systems which follow the same principle as above with plants in blocks stacked one on top of the other to form a wall.
Ronald Lu & Partners Green Wall, Hong Kong 2010
Photograph byRonald Lu & Partners