Buildings by nature are intrusive and obstructive to the
environment. They disrupt the natural flow patterns and strain our natural
drainage systems. Green roofs can conceptually serve as a replacement for the
ground occupied by the building (see green roof concept below).
Typically, a green roof includes a waterproofing membrane
layer that protects the building, soil, and plants overlying a traditional
roof.
Detailed version of the layers in a green roof |
Sustainable
Benefits
Not only are green roofs attractive but it is an
important way to solve environmental issues such as, energy consumption,
improving water and air quality, lowering temperatures on the roofs, and lessening
the impact of the urban heat island effects. Below I will go more into detail
about each of these issues and how green roofs combat them.
Energy
Consumption
Conventional roofs, also known as, black roofs derive
from petroleum based black tar or rubber. These materials absorb energy from
the sun and can reach high temperatures up to 150°F in the summer. If you live
in a building where your air conditioning bill skyrockets in the summer this
might be a reason why. The great thing about green roofs is that they help
combat this problem by absorbing less sunlight, in comparison to black or white
roofs, through a process called evapotranspiration. In addition to this, they also have the
capability to act as an insulator that reduces heat flux and takes the heat
from the building’s exterior to the interior through the roof by up to 72%.
Water
Quality
When storms occur, alternative roofs can create runoffs
flowing into sewer systems and this helps with water pollution and flooding. Green roofs reduce the amount of storm water
runoff and delays the time at which runoff occurs. Furthermore, the soils and
plants absorb rainwater, lessening the impact on storm drainage. If native
plants are used, they may require little to no maintenance.
Air
Quality
New York City is full of smog but plants are those helpful
friends that remove air pollutants no one wants like carbon dioxide and carbon
monoxide. Green roofs can create healthier cities because it contributes to
smog reduction using the plants that are on the roof.
Urban
Heat Island Effect
Planted roofs can lessen the impact of the urban heat island
effect by decreasing the rates of heat-related illnesses, improving air
quality, and further insulating the roof, which improves a building’s energy
efficiency.
Reduce
Sound / Longevity
A green roof provides a natural layer of protection for
buildings and insulation that extends their life and thereby reducing waste and
frequency of replacing roofs. Unlike conventional roofs, green roofs absorb
sound and reduce the noise transmitted around dense populations.
Aesthetic
Impact
In addition to the economic benefits listed above, there
are so many aesthetic positives that can accompany a green roof. Green space
can serve as a quiet refuge within the sometimes chaotic urban environment,
allowing users to connect back to nature. Aesthetically, green roofs can
improve the views from neighboring buildings. I would much rather see a
beautiful view consisting of someone’s garden instead of roof membranes, and
unsightly mechanical equipment any day. Look at the beautiful aerial view of
the green roof at Chicago City Hall.
Chicago City Hall Green Roof |
Financial
Consideration
The added cost of the green roof can partially, if not
fully, offset through lower utility rates, tax benefits, and higher market
values. It becomes a highly marketable and visible amenity; it is cost
effective in the long run and can help you save money. These are among the many
reasons that we are such a passionate proponent of green roofs and attempt to
use them in our projects whenever possible. Like in our project 93 Bright (see
picture below)
Green roof at 93 Bright |
Our building 93 Bright includes a green roof that is a great amenity for tenants and benefits from its sustainable qualities. JMA loves seeing greenery in the city and finds it so important to bring nature back into large metro areas. Besides green roofs being attractive, it provides many benefits to the environment and it helps improve our cities. Green roofs are the ultimate win-win situation for everyone involved so don’t hesitate go green with the rest of New York.
Citations
United States General Services Administration. "The Benefits and Challenges of Green Roofs on Public and Commercial Buildings." United States General Services Administration, May 2011. Web. 12 May 2017
Chicago City Hall Green Roof Image Source: TonyTheTiger, Chicago City Hall Green Roof. 2008, Digital Image. Available from Wikipedia.
Thanks for the post. Know the major effects of green roofs,To protect the building Polycarbonate Sheet price in Chennai are preferred. It protects from the heavy temperature. It includes some materials and construction things to support the building walls.
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