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Rooftop Garden Installation

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Bryan Apacionado

on 5 December 2011

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Transcript of Rooftop Garden Installation

GREEN ROOF Green Roof Bryan V. Apacionado May 24, 2011 Types of Green Roof INTRODUCTION Extensive Green Roof Intensive Green Roof Benefits 1.Reduction in building’s energy cost 2.Improve air quality 3.Reduction in Urbat Heat Island Effect 4.Storm water Management 5.Noise reduction 6.Roof Membrane Durability Green Roof Specialized roofing systems that support plant growth on rooftops. (Liu et al., 2004) The term "green roof" is generally used to represent an innovative yet established approach to urban design that uses living materials to make the urban environment more livable, efficient, and sustainable. Also known as eco-roof, living roof, planted roof or vegetated roof. (Snodgrass and McIntyre, 2010) History Green roofs are not a new phenomenon. (Peck and Kuhn) Green roofs can be traced back through time beginning with the Hanging Gardens of Babylon constructed around 605 BC. In modern times, European Countries, particularly Germany, is the leader in green roof research and technology. Today the level of green roof coverage in Germany increases by about 145 million square feet (13.5 million square meters) per year (Oberdorfer et al. 2007) This growth was stimulated largely by state legislation, municipal grants and incentives. (Peck and Kuhn)  In Asia, Japan has become a center for green roof technology. Its capital, Tokyo, is the first city to mandate building vegetation must constitute 20 percent of all new construction. (Wark and Wark, 2003) Recently, other Asian countries like Singapore and the Philippines saw the benefits of green roofs. Green roofs have the potential to improve the thermal performance of a roofing system through shading and evapotranspiration, thus reducing a building’s energy demand for space conditioning. (Liu and Baskaran, 2003) Under a green roof, indoor temperatures were reduced by around 4˚C when outdoor temperatures were between 25˚C and 30˚C (77˚F and 86˚F).
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.
Relatively flat
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!
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