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GREEN ROOFS

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Evan Janes

on 18 November 2014

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Transcript of GREEN ROOFS

Green roofs can be found in a variety of scales such as rural settings to institutional and even large scale industrial sites. Waterproofing the roof is a key factor when building it, in order to ensure a successful long life for the system.

In order to achieve waterproofing capabilities green roofs are constructed in several different layers. These layers include structural support on the bottom and vegetation on the top.

In between these layers consists of insulation, drainage and waterproofing materials, which help with the overall system of the green roof.
GREEN ROOFS
INCREASING BIO-DIVERSITY
The creation of a green roof becomes the creation of, or the replacement of, a habitat for a number of species. The construction process inevitably alters the existing ecosystem of the site in which it was built. The installation of a roof garden allows for some of that loss to be recuperated providing a living space for insects, birds, and potentially native plant life which are able to access that rooftop ecosystem. These animals would otherwise have needed to relocate permanently to another area . This is especially important in cities, where environmental goals are looking to be met now more than ever.
PHYSICAL CHARACTERISTICS
BENEFITS
The layers and organic material on the roof serve as additional insulation, lowering energy costs for heating or cooling the structure.
GREEN ROOFS IN CITIES AND IMPLEMENTATION ISSUES
Adding Green Roofs to buildings in cities is a great way to make a city more sustainable and reduce the urban heat island effect. Though it may be an excellent idea, those who try to build green roofs do face some barriers. Not all cities, from a governmental perspective level, are promoting green roofs. Building owners must be convinced that it will be a successful idea. In some cases with private buildings, there are multiple owners to convince. With multiple owners, it complicates who is going to maintain it, as well as pay for it. Adding green roofs to buildings that are already built can also is difficult due to structural issues. In this case, lighter plants and grasses that don’t need constant maintenance would work best.

A SUSTAINABLE DESIGN STRATEGY
Why implement a green roof?

A green roof has a variety of benefits for the structure, its environment, and its owner.
The plants and soil act as an additional water barrier and collection system. They help to keep rain water out of the building; collecting, storing, and in some cases filtering the water so that it comes out cleaner on the other end.
In cities and other densely built areas a green roof can replace habitats, add valuable outdoor activity spaces, and greatly reduce the urban heat island effect. The plants on the roof also remove carbon dioxide form the air and produce oxygen, freshening the air and making it more healthy.
As construction continues we must be able to find a balance between new development and protecting the environment. There are both environmental benefits as well as energy efficiency gained from green roofs.

“Green roofs replace the vegetated footprint that was destroyed when the building was constructed.”- Michigan State University Green Roof Research Program
DIAGRAM SHOWING THE LAYERING OF MATERIALS IN A GREEN ROOF SYSTEM
AN ACTIVE AND SUCCESSFUL ROOF GARDEN
A PHOTO OF A SUCCESSFUL URBAN GREEN ROOF
PHOTO OF ANIMAL AND PLANT LIFE IN A GREEN ROOF ECOSYSTEM
A BRIEF HISTORY
Green roofs have existed in some form for a long period of time.
Northern European cultures employed them as a tactic to help their homes to stay warmer during the harsh winters.
Rooftop gardens became popular during the early 20th century, and were included in Le Corbusier's five points of architecture.
Designers that are focused on sustainability have found ways to, usually in a more passive manner, employ this strategy in buildings that were not originally designed for it.
TYPES OF GREEN ROOFS
Green roofs may be employed in a variety of ways, and may be built originally or retrofitted into a structure.
The most intensive method involves building a system to contain and drain excess rainwater from the plantings directly into the building's fabric.
Details
When deciding what types of features to add to a green roof, a variety works best. Growing a variety of grasses, flowers, and other types of plants will invite a wider array of wildlife. Water features, dead logs, and nest boxes can also increase the potential for the roof to act as a habitat. The roof wants to attract multiple species, especially ones that are local to the area, thus creating more diversity.
References:
• "Biodiversity." In Intensive, Semi-Intensive, and Extensive Green Roof Design. N.p., n.d. Web. 06 Oct. 2013. <http://www.greenrooftechnology.com/biodiversity>.
• "Green Roof Benefits." GRHC WEBSITE. N.p., n.d. Web. 06 Oct. 2013. <http://www.greenroofs.org/index.php/about/greenroofbenefits>.
• "Green Roof Research Program." MSU. N.p., n.d. Web. 06 Oct. 2013. <http://www.hrt.msu.edu/greenroof/>.
• "Green Roof Research Program." MSU. N.p., n.d. Web. 06 Oct. 2013. <http://www.hrt.msu.edu/greenroof/>.
• "LID Urban Design Tools - Green Roofs." LID Urban Design Tools - Green Roofs. N.p., n.d. Web. 06 Oct. 2013. <http://www.lid-stormwater.net/greenroofs_specs.htm>
• "Categories." Rooflite Rooflite Intensive. N.p., 2012. Web. 11 Nov. 2013.
• Holzmüller, Katja. "Climate Protection, Naturally – Green Roofs in Düsseldorf." Greenroofs.com: Climate Protection, Naturally – Green Roofs in Düsseldorf, By Katja Holzmüller. N.p., n.d. Web. 11 Nov. 2013.


Other extensive, retrofitted systems are simple additions that are placed on top of the existing flat roof drainage system, that require little trimming and maintenance .

AN INTENSIVE, INTEGRATED GREEN ROOF SYSTEM
AN EXTENSIVE GREEN ROOF
In Chicago, they put a large green roof on their city hall (next slide) proving that their leaders are looking towards the future of green design. In their case, City Hall is a government building, making it easier to implement.

This project was meant to be an experiment for Chicago, testing the capabilities of the 100 year old roof, using native and non-native plants.

Various depths of soils (4", 6", and 18")

Decreased roof surface temperature by as much as 78 degrees, and air temperature by 15 degrees



A PRACTICAL EXAMPLE:
CHICAGO CITY HALL
MADE BY: Stefan Forsberg, Evan Janes, Ross Kahn,
Zach Kushner,
and Osman Mandzo
(FInal T-17)
KEY INDIVIDUALS
Municipal organizations are key to the process of implementing green roofs.

They educate the public and dissolve preconceived notions and wariness regarding the implementation of this technique.

Some areas, such as Chicago, have already taken the first steps towards popularizing green roofs, acting as leaders in the field.
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