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Rooftop Garden Installation
Transcript of Rooftop Garden Installation
Wong et al. (2003) and Kohler et al. (2002) Forty pounds of PM is roughly how much 15 passenger cars will emit in a year of typical driving. (Highway Statistics. 2004) Green roof plots reduced noise transmission by 5 to 13 decibels (dB) over the low to mid frequency range and by 2 to 8 dB over the mid to high frequency range. (Connelly and Hodgeson. 2008) Experience from Europe shows that a green roof can double the life span of a conventional roof by protecting the membrane from extreme temperature fluctuations, ultraviolet radiation and mechanical damage. (Peck & Kuhn, 2001)
Surface temperature of an exposed roof membrane reached over 60ºC on a hot summer day in Ottawa, Ontario. Under a green roof with 150 mm of growing medium and grass, the roof membrane did not reach 30ºC. (Liu, 2003) 7. Urban wildlife habitat Green roofs provide food, habitat, shelter, nesting opportunities and a safe resting place for spiders, beetles and birds. (Ryerson University)
A study of 17 green roofs in Basel, Switzerland found 78 spider species and 254 beetle species over a three year period. Of these, 18% of the spiders and 11% of the beetles were considered endangered or rare (Brenneisen 2003).
Ground nesting birds were able to use extensive green roofs as nesting sites in urban areas (Baumann 2006). Aesthetics:
Urban greening has long been promoted as an easy and effective strategy for beautifying the built environment and increasing investment opportunity.
Health & Horticultural Therapy:
Studies suggest that viewing green space and nature can reduce stress, ease muscle tension, and lower blood pressure (Ulrich and Simons 1986)
When viewed at work natural landscapes can increase job satisfaction and reduce reports of headaches and illness (Kaplan, Talbot et al. 1988). Other benefits Differentiated mainly by the cost, depth of growing medium and the choice of plants. VS Intensive (High-Proile/Roof Gardens)
> 6"-15" and deeper
Heavier weights: 50+ lbs/sf
Trees, shrubs and more
Huge variety of plant selection/ architectural features depending on loads, design & budget
Designed for human recreation gardening,socializing, etc.
More expensive: $25-$40+/f2
Irrigation usually necessary
Higher maintenance Extensive (Low-Proile/Ecoroofs)
Low growth media: 2 – 6"
Lightweight: 13 – 50 lbs/sf
Low growing plants: 1"– 24" H
Less variety of plants: succulents, herbs, some grasses and mosses
Usually non-accessible and non-recreational
Slopes up to 30° & higher
Less expensive: $5-$25/f2
Low water requirements
Low maintenance Extensive Intensive Green roof Systems Fully adhered: assembled directly on roof from
delivered components Modular: assembled and planted off-site, hoisted to roof, linked together and if necessary, anchored
in plac Plants are able to act as air filters, removing gaseous pollutants and airborne particulates by incorporating them into tissue or passing them through the roots and into the soil (Getter and Rowe 2006). Another study reported a 37% reduction of sulfur dioxide and a 21% reduction in nitrous acid in the air above a green roof when compared to other air samples taken nearby (Yok Tan and Sia 2005). Can remove 0.2 kg of dust particles per year per square meter of vegetated roof (Peck, Kuhn et al. 2003). GREEN ROOF Norwegians developed sod roofs centuries ago as a means of thermally insulating their buildings. (Wark and Wark, 2003) Green Roof Considerations Use Location Consultants Structure Access and Exits Vegetation Planting Media Filter Membrane Root Barrier Thermal Insulation Waterproof membrane Cover board Vapor barrier Building and roof structural support Drainage layer Green roof
Components Cost Maintenance Decrease the "urban heat island effect" through the process of transpiration and humidify dry air. Every 0.5˚C in internal temperature reduction can result in up to 8% reduction in air conditioning electricity costs (Dunnett and Kingsbury 2004). Introduction to Researchers estimate that a 1,000-square foot (93 m2) green roof can remove about 40 pounds of PM from the air in a year, while also producing oxygen and removing carbon dioxide (CO2) from the atmosphere. (Peck, S. and M. Kuhn. 2003) 25% green roof coverage can reduce the UHI by up to 1.8°F/1°C Moran, Hunt et al (2005) reported 57% to 87% reduction in runoff rates from green roofs when compared to those of conventional roofs. Construction/ installation Thank You!