Attachment B Green Roof Plan

7                Case Studies




1. American Society of Landcape Architects Headquarters, Washington DC - 2005                                                                                                  2. California Academy of Sciences, San Francisco




The American Society of Landscape Architects Headquarters 3,300 square foot green roof garden was designed by Michael Van Valkenburgh Associates in                            The California Academy of Sciences building, designed by Renzo Piano supports a 2.5 acre green roof with a focus on sustainable design strategies. This case study
collaboration with the Conservation Design Forum. This case study exemplifies the fusion of the environmental with the humane through the employment of ‘the                   is an example of green roof design for sloped roofs as well as one utilising native plant species for suitably to the harsh conditions of a green roof environment.
waves’ (vegetation) and ‘the grating’ (vegetation/grating) which allows access into the roof without taking area away from the green roof. The grating/vegetation
system covers sixty percent of the accessible surfaces.                                                                                                                        “Assembling a 197,000-square-foot rooftop to accommodate a living tapestry of native plant species is challenging enough. Add to that the technical problems
                                                                                                                                                                               posed by the roof’s extreme dips and slopes. How to keep the plants and soil from sliding off? Rana Creek, who worked with Piano to design the roof, developed and
Green roofs can create habitats for flora and fauna through careful composition of growing medium, plants and the manipulation of micro-climatic conditions. Due to            patented a solution called the BioTray®. They used 50,000 porous, biodegradable trays made from tree sap and coconut husks as containers for the vegetation.
a sturdy roof structure a deeper growing medium was possible in this example which has the following benefits:                                                                 These trays line the rooftop like tile, yet enable the roots to grow and interlock, binding the trays together like patchwork.”
- important for the survival of invertebrates
- plants better withstand dry, hot periods due to moisture retention in lower portion of the roof profile                                                                      “The living roof´s 1.7 million native plants were specially chosen to flourish in Golden Gate Park´s climate. After experimenting with thirty native species, the finalists
- after drought conditions deeper growing media allow for a greater seed bank, that can establish to replenish bare areas of the roof where plants did not survive.            were all able to self-propagate. These nine species, located inside and outside of the special exhibit, will thrive with little water, resist the salt spray from ocean air, and
                                                                                                                                                                               tolerate wind.” http://www.calacademy.org/academy/building/the_living_roof/
Another distinguishing factor of this roof is the varying solar expositions of it’s green surfaces which results in creating different micro-climatic conditions. The varing
expositions and soil depths of the roof create varying moisture regimes that influence the distribution of animals and plants. (Werthmann 2007)




                                                                                                                                                                                                                                                                                                          Green Roof Proposal
                                                                                                                                                                                                                                                                                                                              Date : 24.09.2014
                                                                                                                                                                                                                                                                                    Hasler Residence, Seaview Terrace                                      A