Search
Back to Home Page
Home   |   Contact Us Ph: 443-345-1578

Green Roof Technology Blog

Nation’s largest Solar Garden Roof

Green Team at Green Roof Technology, - Wednesday, July 03, 2013


Photo courtesy of Elkus Manfredi Architects and BHC Architects.

Green Roof Technology is proud to announce their partnership with BHC Architects to design the largest Solar Garden Roof in North America.  The Solar Garden Roof will rest atop the new, soon-to-be build Exelon headquarters in Baltimore, MD. 

Exelon’s office tower will be the tallest building in the upcoming Harbor Point multi-use business park, scheduled for completion in Fall 2014.  

The Exelon headquarters rooftop will house a 40,000 sf green roof and an estimated 400 Sun-Root™ Modules, which will generate approximately 120,000 kWh’s a year.  This will be the largest Solar Garden Roof in North America.

For more information about the Solar Garden Roof System and to see a short video of how it all comes together, please visit:  http://www.greenrooftechnology.com/solar-green-roof.


Combining Urban Rooftop Farming with Public Transportation

Green Team at Green Roof Technology, - Saturday, June 22, 2013

By: Jörg Breuning

Photo: Bauder, SSB Stuttgart Germany

Germany is the country of inventors, poets and thinkers. According to historical research, rooftop farming has been a long tradition since the mid-evil times in the dense cities of Europe. The lack of open space inside city walls brought people up to their roofs. Because there was also no efficient sewer systems, it was easy to utilize the organic remains to fertilize and grow plants. Throughout the centuries, survival proved to be a tough journey, mainly caused by overpopulation. When it became too dangerous to venture from your house, people discovered their roofs as additional space for growing their own food in order to overcome these rough years. Currently we are witnessing this growing trend once again in many metropolis areas in North America. The motivation is still the same, jobs can be hard to find, it's difficult to stand out when everyone is competing for essentially the same things.

Luckily our sewer systems are more advanced today, synthetic fertilizers are cheap and these farms do not depend on organic remains anymore. The quality of food should be acceptable in this respect - disregarding the extreme rates of pollution within cities.

However, let us backtrack to the topic of inventions.

Growing food on rooftops of the public transportation system (buses and trains) can help to combine two major needs of urban citizens. The added value is that your transportation systems are now also farmer's markets and while riding the bus home from your cubical, you can manage all your food shopping in one step including fresh produce grown directly above - on the roof! If the roof of the transportation vehicle is a semi permeable membrane, the carrots actually can be harvested from the inside. How convenient would this be? Depending on the crop, the sunny routes have more sun loving veggies and the transportation system manages regular crop changes from a more balanced and diverse food supply. Think about all the new jobs being created!

Sure, this technology is just in the beginning stages, but with the current hype for locally grown and diverse environmental approaches, it is just a matter of time until people will also jump on the bandwagon (or bus). It is just as ideal to look for some free advertising space in the press.

So, see you on the Lemon Line or drop me a line from the carrot bus (they should probably invest in free WiFi too).

 

Jörg Breuning welcomes people who want to learn from decades
of green roof experience - askjorg@greenrooftechnology.com

Green Roofs and Stormwater Fee

Green Team at Green Roof Technology, - Friday, May 17, 2013

Green Roofs Can Reduce Stormwater Runoff, Reduce Stormwater Fees!

By: Rebecca Gullott

Not many Marylanders are happy about paying the new stormwater fee or “rain tax” as it has come to be known. The county imposed fee is based on the amount of impervious surface such as rooftops and driveways on each property (cost-by-cause principle). In Howard County alone there are over 19,000 acres of impervious surfaces that contribute to pollution of local streams and the Chesapeake Bay. 19,000 acres are almost 30 sq miles or 11% of the counties size- more than double the size of all water ways in the county! No wonder that Stormwater runoff is responsible for over 20% of pollution into the bay.

Those wishing to lessen their stormwater fee can reduce the impervious surface area on their property through smart design and management practices. Howard County is providing instruction and incentives for citizens to do just that. Howard County Stormwater Management Division has partnered with several organizations including the University of Maryland Extension to help citizens take control of their environmental impact. Rainscaping workshops will be offered this summer to show residents how to plant and maintain rain gardens and native species; as well as compost waste and use rain barrels to collect roof runoff for use in lawn and garden irrigation or car washing. Howard County is offering free rain barrels at the Alpha Ridge Landfill select Saturdays April through September. Other Maryland Counties have similar programs so check your county’s website to see what offerings are available.

Property owners can receive credits for on-site improvements that reduce impervious surfaces. Whether it’s establishing a rain garden in the yard or incorporating planted areas or green roofs into the company’s parking lot, these incentives may encourage citizens to take control of their environmental impacts. These changes may help to reduce the need for future stormwater fee increases and promote a healthier Chesapeake for years to come.

The possitive impact for the environment by implementing cost-by-cause fess is very effective in many other counties and States in the US and over decades in Europe.

Irrigation on Extensive Green Roofs

Green Team at Green Roof Technology, - Thursday, May 02, 2013

By: Jörg Breuning

The main purpose of an extensive green roof is stormwater retention and delaying stormwater runoff amongst many other added values.
 
Above: An Irrigated Green Roof 

In the last decade, I've seen many green roofs where the intended plants never really flourished. I estimate that in the US at least 50% of the green roofs are not performing to their fullest potential. This can be observed by simply looking at the most obvious of indicators, the plants themselves, regardless if they were planted on purpose or somehow found the space to take root.  Most of these less healthy extensive green roofs are pre-planted boxes, or commonly known as modular systems. Not only are these systems much more costly, the mid to long term results are often far below systems that are assembled in place and at the time of installation.

I know that the transition from being a common nursery-grown plant (including pre-planted boxes) to the extreme environment of a rooftop poses severe challenges. Green roof plant nurseries typically have "great" advice and recommend the installation of temporary or more permanent irrigation systems. This advice is defeating the purpose of an extensive green roof and shows that asking self-appointed experts can cause a spiral of failures. Since many green roof installers lack the proper horticultural knowledge, they may not be able to identify problems by simply looking at the indicators (the plants). This could cause the problem to gain momentum. In addition, the false conclusion that technology (Google search, Apps, synthetic growth media or sophisticated soil moisture control devices) can fix the problem supports my theory of less experienced or misinformed green roof professionals. They rely heavily on technology to fix any issue and miss the big picture. Nature has the ability to take care of itself, as long as the appropriate design, materials and plants are used in addition to being familiar with the immediate climate.

Green roof designers and green roof professionals must understand that less is often more when it comes to extensive green roofs. No building owner wants to irrigate their roof in short, mid or long terms. There is no need to make a green roof more complicated by using multiple synthetic or plastic layers. LEED™ certification supports using gray (recycled) water for green roof irrigation; but what is the point of watering an extensive system when it's main purpose is to retain stormwater? Common sense and experience are the only two things that will aid in planning the perfect green roof.


Above: An Unirrigated Green Roof

Implementing irrigation on an extensive green roof is a clear sign of not understanding the basic principles of horticultural techniques or the laws of nature. Irrigation reduces the water retention, increases the nutrient pollution in runoff and requires higher fertilization application. Irrigated extensive green roofs are not environmentally friendly, not economically feasible and have hardly any payback for the building owner.

I tell my clients if they have an offer or design for an extensive green roof that includes irrigation - be cautious!

 

Lancaster Green Roofs Receive a Little More Green

Green Team at Green Roof Technology, - Thursday, April 25, 2013

By Andrew Yanders


E. King Fire Station after receiving 70 lbs. of Sedum Cuttings.  Five varieties of cuttings were spread that day and 6 varieties of   herbaceous plugs

Last week I traveled to the City of Lancaster to oversee the install of 155 lbs. of Sedum cuttings on the Dewatering Building and E. King Street Fire Station green roofs.  Both green roofs were installed earlier this year during the winter months.  The Dewatering green roof was installed January 22nd through the 25th and just under two months later Fire Station green roof was installed. 

There is a common misconception that green roofs cannot be constructed and vegetation planted during the winter months.  Actually, we believe installing green roofs when spring is just around the corner is ideal.   The weather may not be to the likely of many fair-weather green roofers, but for those who are willing to brace the cold and wet, the payback for the client is well worth it.  By establishing the vegetation in its new soil media prior to the start of the growing season, plants are able to jump start their growth and the first 2 months of the growing season can be equal to more than 6 months of growth if the same plants were planted later in the year.  Unfortunately, too often vegetation (in this case the Sedum cuttings) is not available until the spring when it is more advantageous for the nursery.

It was so cold the week we installed the Dewatering Building’s green roof that the growing media and Sedum mats arrived frozen solid.  The growing media had to be defrosted overnight inside the garage portion of the building and the Sedum mats that could not be unrolled were left out in the sun for one day.  Despite being completely frozen prior to install, the health of the Sedum mats was not compromised at all. 

There is one detail that must be given special attention when planting during the winter months.  When planting plugs, it is critical that they are planted as deep as possible.  If this requires loosening or removing a portion of the bottom, so be it.  But if they are not planted deep and the soil well compacted around them, then plugs will migrate up out of the soil during periods of freeze and thaw.  This can happen to the extent that a plug becomes completely removed from the soil, exposing the root system to the elements, and often results in the plug withering and dying.  Plugs are not cheap and a negligent planting technique is a waste of the client’s money. 

 

The color of the Sedum mats on the upper portion of the Dewatering Building's green roof has changed from mostly reds to a variety of lush greens.  New growth is abundant.  

Preparing the soil for Sedum cuttings is critical.  Because the soil was installed several weeks prior, the top layer of the soil needed to be loosens and leveled.  This increases the contact area between the soil and the cuttings, promoting more abundant rooting.

Even though there was a light rain while spreading the cuttings, we still watered the green roof.  We wanted to ensure there was uniform moisture throughout the roof, but also the moisture helps to hold the cuttings in place until they begin to root out in a few days.  

Green Roof Technology Partners with Anacostia Watershed Society

Green Team at Green Roof Technology, - Friday, April 19, 2013

By: Samantha Yurek


Photo Credit: Anacostia Watershed Society

Green Roof Technology has recently partnered with the Anacostia Watershed Society; an organization dedicated to keeping the Anacostia River clean and healthy. Through our partnership we hope to achieve a common goal to increase green spaces and to protect our Anacostia River watershed which runs through our nation's capital and into Maryland. Since 1989, the Anacostia Watershed Society has been the first organization dedicated to protecting the Anacostia River.

ThAnacostia Watershed Society had recently put forth a Green Roof Rebate Program, aimed to encourage residents and building owners to reduce their stormwater runoff on-site and decrease the burden on the District's Combined Sewer Overflow. Available for residential, commercial and institutional properties, this rebate program will reimburse you with $5 per square foot of green space implemented on the property.For most commercial green roofs, that rebate can reduce your overall costs dramatically.

The District Government's Green Roof Rebate Program is administered by the Anacostia Watershed Society and encourages to contact us to see if they are eligible. Feel free to check out the Anacostia Watershed Society homepage here.


Photo Credit: Anacostia Watershed Society

Stormwater Fee Looming Overhead

Green Team at Green Roof Technology, - Thursday, April 11, 2013

 By: Samantha Yurek


Photo Credit: The United States Geological Survey

The Chesapeake Bay is the heart of Maryland. Not only does it fuel our economy and recreational activities, with over 64,000 square miles it is home to over 2,700 different species of flora and fauna. It is an important resource that should be cared for adequately.

Excessive runoff is a huge culprit of transporting trash, chemicals, nutrients, along with other things that end up polluting the bay. With storm season lurking around the corner, Maryland is trying to prevent these mini flood events from polluting the Bay even more.  To mitigate for these rushing stormwater events, stormwater fees  will soon be added to everyone's quarterly water bill. There is no avoiding this fee that will essentially be paying for the impervious surface area one has on their property. Residential properties won't have such a heavy fine, but businesses may have to start paying a pretty penny. For example, take a look at any mall, the entire property is a combination of roof and blacktop.

The stormwater fee may be something you worry about, but there are ways to reduce the fees.  Planting trees, implementing rain gardens, and most importantly, adding vegetation to your rooftop are all proven ways to earn credits toward reducing the cost of the fees. Let's strive to keep Maryland beautiful; the Chesapeake Bay thanks you.


Photo Credit: Green Roof Technology

New Optigrün Edging System Type SKL for Extensive Green Roofs

Green Team at Green Roof Technology, - Thursday, March 28, 2013

Optigrün International AG (1-800-627-4955) recently released a completely redesigned green roof edging system.  Created from 3.5 mm recycled ABS (with UV stabilizers of course), the new edging system uses hinge and click connections.  The 3-point connection system is quick and makes laying perfectly straight edges a breeze.  

The Type SKL edging system is available in 8 cm & 12 cm heights.  The edging system consists of two types of pieces, 1100 cm lengths and 300 cm corners.

The versatile and easy to ship system can be designed for numerous applications such as separations, terminations & drainage channels. For more information and purchase opurtunities in North America please contact us at Green Roof Technology.

Ideal for roof slopes up to 5°.

Picture: Optigrün / Green Roof Technology


Follow Us!

RSSGreen Roof Tech Blog
RSSGreen Roof Plant Blog


Recent Posts


Tags


Archive

Latest Blog Posts
  1. Celebration 20 years of Integrated Green Infrastructure Green Team at Green Roof Technology, 12-Jul-2018
  2. Power Plant and Green Roof Green Team at Green Roof Technology, 10-Jul-2018
Facebook   Twitter   LinkedIn   Google+   YouTube
Go To Resources Page