Presentation on theme: "GREENROOFS from rooftops to green acres. traditional roof garden, planting is done in freestanding containers and planters, located on accessible roof."— Presentation transcript:
industrial box green surface In Germany Stuttgart requires green roofs on all new flat-roofed industrial buildings
layers of a green roof system the plants, often specially selected for particular applications an engineered growing medium, which may not include soil, a landscape or filter cloth contain the roots and the growing medium, while allowing for water penetration, a specialized drainage layer, sometimes with built-in water reservoirs, the waterproofing / roofing membrane, with an integral root repellent the roof structure, with traditional insulation either above or below.
Intensive often accessible diverse plant communities several layers of materials depth from 20–60 cm (8-24"), with a saturated weight increase of between 290 - 967.7 kg/m2 (60-200 lbs/sf) Extensive often not accessible simple plant communities less layers of materials depth between 5-15 cm (2-6") weight increase of between 72.6-169.4 kg / m2 (16-35 lbs/sf) when fully saturated
Tests show that 12 cm (5") of growing medium can reduce sound by 40 db. School boards can integrate curricula and provide added green space for students – outdoor rooftop classrooms Effluent produced by a factory is treated in an on-site sewage pond at grade and then filtered through the green roof Greenroofs absorb and/or deflect solar radiation Green roofs can be designed for exceptional storm water retention capability Green roofs can be designed as acceptable alternative habitats for some species, as the rocky alvars of Manitoulin Island and and to birds species that only nest on the ground.
Current Examples of Green Roofs Chicago City Hall –Began April 2000 –Experimental study on green roofs –Both intensive and extensive green roofing
Current Examples of Green Roofs Ford Rouge River Plant, Dearborn Michigan –Part of Ford’s redevelopment of their plant; “sustainable manufacturing.” –454,000 square feet of green roofing; largest in the U.S.A. –Other environmental initiatives such as porous paving, green screens, and the planting of 1,500 trees.
Current Examples of Green Roofs Rockefeller Center, NYC ESL Company, Germany Gegenbaur Golf Course, Berlin
GREENING TORONTO’S ROOFS Toronto has several Green Roof initiatives –Toronto City Hall –Eastview Neighbourhood Community Centre –Sears Merchandising Lofts Building –Mountain Equipment Co-op –Manulife Centre –Roundhouse Park – Metro Convention Centre
TORONTO CITY HALL 100 Queen Street West 7,000 square feet
EASTVIEW COMMUNITY CENTRE & SEARS LOFTS BUILDING Neighbourhood Community Centre 5,230 square feet 155 Dalhousie Street 10,000 square feet
MOUNTAIN EQUIPMENT CO- OP 400 King Street West 9,700 square feet
ROUND HOUSE PARK Metro Toronto Convention Centre Parking Garage Bremner Boulevard 4.7 hectares
IMPLICATIONS FOR TORONTO’S ECOLOGICAL SUSTAINABILITY Toronto is on the right track. The number of green roofs are a sign of good things to come (hopefully). What is needed is the kind of incentive found in places like Germany, where local governments have created incentives through tax levies and density bonuses. The support of all three levels of governments. More studies and research; quantification of benefits to make green roods attractive to private companies & the general public. Awareness and education regarding the benefits of green roofs.
New Material Feb 1, 2006 Toronto City Hall made big greenroof Announcment, and Ryerson report is part of website now. Slide has link More images of greenroofs from Germany, Egypt, China, Europe, USA, showing variety in design. Greenroofs pretty mainstream in N. American govt buildings, a few homes, and a long way to go for industry it seems. Little on mapping green roof areas, showing % coverage, strategic green roofing, as you’d suggested at city hall presentation in November.
In the fall of 2004, Ryerson was selected to carry out the project to research the municipal level costs and benefits of green roofs. A diverse team was assembled to make the study happen as shown in the diagram below. Here is their report: http://www.toronto.ca/greenro ofs/pdf/fullreport103105.pdf
Clockwise from lower left: Farid's kitchen garden; planting strawberries at Al-Orman School; the three-level tube system; Al-Zawya Al-Hamra green rooftops. Cairo, Egypt Source: http://weekly.ahram.org.eg/2005/745/en2.htmhttp://weekly.ahram.org.eg/2005/745/en2.htm
The hydroponic farm on the atrium of the 800-bed Changi General Hospital in Singapore. The bare concrete of the atrium roof was a problem in that it diverted sunlight into nearby wards - to cause objectionable glare and heating. The rooftop hydroponics, growing cherry tomatoes and herbs, solved the problem and created a rooftop farm that now supplies patients with healthy fresh food. Another Singapore hospital is about to go even further in food from the roof. Source: http://www.greenroofs.com/guest _features.htm#Guest%20Feature http://www.greenroofs.com/guest _features.htm#Guest%20Feature
The clip-together Australian oval pipe system that provides lightweight hydroponics for rooftops and balconies in Singapore. Source: http://www.greenroof s.com/guest_features. htm#Guest%20Featur e http://www.greenroof s.com/guest_features. htm#Guest%20Featur e
Two Australian growers have proved that papayas in hydroponics, like this one, can be grown to production of fruit in little more than half the time of soil-grown "Trees." The hydroponically-grown fruit is claimed to be tastier. The tropical papaya is predicted to become a favoured fruit to be produced from rooftops under hail netting in Singapore, and could form a most attractive bank of foliage for rooftop restaurants that also picks and serve the ripe fruit chilled, juiced or in fruit salads. Source: http://www.greenroofs.com/guest_featu res.htm#Guest%20Feature http://www.greenroofs.com/guest_featu res.htm#Guest%20Feature