Posts Tagged "green space"

The Green Roof Initiative

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The Green Roof Initiative


Obviously as designers of green roofs, we are very happy about the Green Roof Initiative being passed this week. But more so, the environmental and energy efficiency benefits of green roofs make for a no-brainer. For those who do not know, the Green Roof Initiative (Ordinance 300) mandates, “every building, building addition, and any roof replacement of a building, with a gross floor area of 25,000 square feet or greater, constructed after January 1, 2018, shall include a green roof or combination of green roof and solar energy collection.” Specifically, the total coverage of rooftop requirements increases 10 percent every 50,000 square feet. This eventually caps at buildings of 200,000 square feet or more with 60 percent of the roof requiring coverage by gardens or solar panels.


So, let’s discuss the benefits of green roofs, first, from an environmental perspective. Green roofs provide air quality benefits to the city by filtering particulates from the air in the same manner all green space does. They help to mitigate the effects of urbanization on water quality, often dramatically. Green roofs can do this by filtering, absorbing and retaining rainfall. And ultimately, from a nonhuman-centric mindset, the green roofs restore biodiversity to the urban environment. This is done by returning green space habitats to the local ecosystem.

Economic Impacts

So now let’s discuss the benefits from an economic perspective. Denver’s status, noted in a 2014 study by Climate Central, found the city has the third-greatest urban heat island effect of any American city. An effect partially produced by the radiating of heat off rooftops and pavements. The only American cities that ranked higher are Las Vegas, Nevada and Albuquerque, New Mexico. (The urban heat island effect is the raising of the temperature in the urban environment in comparison to the surrounding areas).

Impacts on Energy Consumption

In the summers, by implementing green roofs on the macro level, we can significantly reduce the overall heat index and our energy consumption used to cool buildings. Urban heat islands are also affected by the reflection of the sun’s rays off the sides of buildings, particularly glass buildings. The effect can be so intense that it can actually scorch trees and grass. A problem ultimately, solvable with more use of green walls. But we’ll leave that initiative for another day, as we wait for green wall innovation to catch up and make more economic sense.

On the micro, per building level, green roofs also work to insulate structures. They’re able to do so by reducing the amount of heat entering a structure in the summers. They can then hold on to artificial heat from the inside in the winters. In addition, the green roof protects the top of the structure from hail damage and wear from the intensity of the sun. This ultimately reduces repair and maintenance costs of the roof when compared to a standard roof. From an energy perspective alone, green roofs have been found to provide a return on investment. Usually within five or six years in many cases.

And finally, from a social and psychological level, green roofs and green spaces in general, provide a mental health benefit. This is called Biophillia. Those who get to enjoy the new view of nature have been shown to experience therapeutic benefits.


A green roof has a vast range of functional opportunity as well though. Green roofs can be made into community gardens, social spaces, recreational areas, and even meeting spaces in an outdoor setting. The initiative doesn’t have to be looked at solely as a dysfunctional space at higher cost. But rather an opportunity, with the required addition of the structural integrity, to turn the roof into a usable space.

Unlike many environmental initiatives, this benefit doesn’t come from taxes at all. This is because the cost is up to the building owner who, in the end, is saved money by energy savings. The only people who don’t benefit from this proposal are large scale developers who simply want to build as much, as quickly, and as cheaply as possible to sell. That’s a mindset that hardly represents the best interest of the people of Denver, the ultimate consumer.


Tannenbaum Design Group | Landscape Architecture and Outdoor Design | The Green Roof Initiative

Date: Nov 14, 2017
AUTHOR: tbaumdesign
Comments: 2

Central Europe Study – Sustainable Communities, Recycling, & Reclamation

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Post World Wars Central Europe might not have a lot a lot of positives you can say were taken away from the devastation of war. However, when everything is bombed to rubble you certainly have a clean slate to start over from when it comes to design. Many cities like Frankfurt, Bonn, and Berlin that suffered the highest amount of city destruction took the opportunity to rise from the literal ashes with a new era of urban design and architecture.

In Frankfurt, for instance, over 50% of the infrastructure was destroyed by 1945. Today, 52 percent of the city area is green space, consisting of parks, woodland, farmland, orchard meadows, grassland, allotments and hobby gardens, cemeteries, roadside grass verges and bodies of water. And as of 2019, Frankfurt has been ranked the most sustainable in the world.

Sustainable communities can arise naturally over time as well, through the reclamation and re-purposing of infrastructure. When a large industrial site or landfill, that used to be on the outskirts of town, finds itself decommissioned and eventually absorbed into the growing city, it can present a multitude of challenges (i.e. contaminated soils, eye sores, wasted space, etc). Europe’s ancient cities can serve as great examples of how to cope and even benefit from these challenges.

For industrial sites, Landschaftspark in Duisburg, Germany is a patent example of how a derelict site can be reclaimed without disturbing the polluted soils through deconstruction and wasting materials and energy in mass deconstruction. Through this they achieve the addition benefit of preserving a bit of history. Landschaftspark was transformed from a disused old industrial ironworks into facilities with multiple uses into a one of a kind park space. The huge buildings of the former ironworks have been modified to provide patrons with a multitude of new functions such as alpine climbing gardens created in ore storage bunkers and a viewing tower made from a decommissioned blast furnace.  Landschaftspark represents how an area can celebrate its industrial past by integrating vegetation and industry, promoting sustainable development and maintaining the spirit of the site without morning it as an eyesore.

Metabolon in Bickenbach, Germany serves as an interesting example of landfill reuse. Metabolon is a multi-purpose site built upon a decommissioned landfill. The site today takes advantage of the artificial topography to serve as serves as a lookout point, bike track, public park, playground, and research center and more. Converting waste to energy is the most significant goal in the research center. What was a disaster for the town has become an attraction and public benefit.

The benefits of recycling and reclaiming are shared among citizens, tourists, developers, customers, and the environment alike. Firstly, an industrial reclamation project produces ecological benefits to the environment and its inhabitants through the growth of plant materials that harbor ecology that break down pollutants in the soils and filter water runoff. Secondly, by transforming dilapidated space into functional and aesthetic pieces, a city brings economic revitalization to the surrounding area. And thirdly, when site is transformed into a useful and attractive space the area becomes more attractive to potential businesses and tourists.

This mindset of design applies to projects large and small. When we think about renovating our residential spaces we have two options. Tear everything out and start anew, or integrate and recycle. Many people in the industry will take the easy road- remove it all and put in new. I urge more of you to consider the value in preserving and recycling the old. Keep more structures out of the landfill. Integrate those priceless 30 year old shrubs into the plans if you can with a nice pruning. Reuse materials where you can. New is not always better, it’s just cleaner for a few years.

Date: Mar 28, 2016
AUTHOR: tbaumdesign
Comments: 1