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15 Million Square Feet of Green Roofs in 2 days!

Green Team at Green Roof Technology, - Monday, April 06, 2015

Over 15 Million square feet of Green Roofs in 2 days!

In the World’s Green Roof capitol it isn’t a problem to walk over 15 million square feet of Green Roofs in two days.
Grinnell College Students, Architects and Professors joined me this year on a two day trip though out Stuttgart Germany.

Within the city limits and a population of around 700,000, Stuttgart can offer likely over 200 millions square feet of extensive and highly divers Green Roofs – more than the entire USA and probably Canada together.

The two days tour emphasized Green Roofs that are between 15 and 30 years old and that host over 40 different plants species. Remarkable is that not a single Green Roof was ever irrigated, nor fertilized in the last 10-15 years and most of them are maintained only once a year.

No Green Roof was ever replaced or fixed and the water proofing under all Green roofs never, ever leaked (in the US 50% of the green roof are getting fixed or replaced in the first 5 years). The average installation costs were at around $4-6/sf (in the US around $12-18/sf).

All Green Roofs have three major functions: stormwater retention, stormwater retention and stormwater retention.

Green Roofs in Stuttgart are part of a building like windows or doors. There is no necessity to make a big fuss out of it.
Being the World Champion in modern Green Roof technology is nothing to celebrate – it is the responsibility of sustainable and environmental conscious lifestyle combine with common sense.

The highlight of the tour was the Bosch Parking Garage with the world’s largest Solar Green Roof that was designed with extremely high diversity of plants that are found only in (local) native dry meadows.
While the Green Roof measures around ¼ Million square feet the PV is designed for 1 Megawatt.
Unmatched world record in this combination on building structure that is 100 feet above a 6 lane Highway.

First Garden Bridge for Pedestrians in North America.

Green Team at Green Roof Technology, - Friday, February 20, 2015

Modern Green Roof technology combined with a Blue Roof to minimize artificial irrigation, to maximize water retention and enable visitors to cross a busy four-lane highway without leaving the lush greening of a park.


The Garden Bridge at Universal Studios in Orlando is the first of its kind in Florida. Designed by Miles Architecture Group Inc., Libra Design Group and Green Roof Service LLC, the green bridge creates an innovative connection of Universal City developments. Selected ground covers, shrubs and trees escort pedestrians almost without notice that they are crossing over a busy highway. The distinctive landmark project is engineered with people in mind.

The Garden Bridge at Universal Studios Orlando project is approximately 3,000 sf (145' x between 18 and 25' wide). The bridge is designed to pond water in the granular drainage area to increase the water retention (a blue-green roof combination, Patent hold by Optigreen - 1978 and the first time introduced to North America by Jorg Breuning in 2001).

Unique projects require unique solutions. Keeping the costs for the structure low, the trees are located above the bridge's pillars. The walkway gently winds up to the bridge and over and is easy accessible for the handicapped or service carts.

The project was possible with an outstanding waterproofing solution by ALT Global. ALT Global meets the FLL requirements for root resitance.


This innovative green roof project is a master piece of teamwork between architects, structural engineers, landscape architects and green roof professionals with an open mind, environmental leadership and common sense.

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Extensive Green Roofs and Irrigation

Green Team at Green Roof Technology, - Tuesday, November 04, 2014

Thank you for all the comments on the blog post:

Irrigation on Extensive Green Roofs


We believe a lot of people in North America agree with the comment that in some areas Green Roofs can't thrive without irrigation. We at Green Roof Technology don’t disagree nor agree. Allow us to bring the discussion into a fundamental perspective:  

Before you built a structure, you have to remove nature or simpler living plants that nobody watered before. Modern green roof technology is able to mimic this type of environment and allows to promote exactly this drought tolerant and hardy vegetation. With a little more understanding of this technology, it is even possible to increase the plant varieties or the plants density.

Nevertheless  the attractivity might not meet the expectations of us (humans). Our picture in mind of a roof garden is a lush green vegetation form that is created with plants that please us (humans), that are not poison or dangerous. In some areas we can achieve this goal by utilizing resources that haven’t been available at this location before the structure was built.

By using natural resources (and water is the most valuable) we start changing our environment (we take water away from somewhere – from plants somewhere) just for our own comfort. Understanding that and the value of water should create an awareness to green roof professionals or engineers to design modern green roof technology in a way that no water or super highly restricted amounts of water are utilized.

Unfortunately, the irrigation industry and most of the green roof designers grew up in an environment where resources are endless. With that said the current waste of water on green roofs is simply not acceptable to me and in these cases green roofs are an environmental nightmare - just for our pleasure (and cash) and that things look “nice and green”.   

When I drive around in neighborhoods in San Francisco in the morning, my car is being washed by all the sprinklers and nobody has a problem with that…..

Simple and efficient technology is here since many decades but not in the interest of the industry, nor “re-invented” in the US or there is a lack of common sense – maybe it is a combination of all.

Most issues I am confronted with, are a result of high tech irrigation that is just not doing what it is supposed to do, there is not the right app, poorly designed and installed, too complicated for facility people etc. or simply drains the budget of building owners over time this water costs are going up.

Let’s discuss further and email us directly:


Comment by Jure Šumi ((LinkedIn):

Interesting input Jorg. Yes, extensive roofs should be self-sufficient where they can be. But in my mind this is not possible in really arid areas like Jim is saying. With our partners in Abu Dhabi we are now investigating what plants should be used there, where top temperatures are regularly reaching 120 F in summer months (with no rain for years). If you use local plants that are surviving in desert than they are surviving only due to the fact that the roots are extremely long and go deep in to the ground to find some moisture (not possible on the roof). Limited irrigation is still needed but the roof needs design with minimised ET, so also irrigation is as low as possible.

Maybe another thing to consider. Yes or no irrigation is also a question of what someone wants from green roof. Nice look is one aspect, stormwater managment is another. We should not forget Energy efficiency. According to our investigation and perfromance tests, evaporation has big effect on energy efficiency in the summer due to cooling effect. If moisture in the green roof system drops below certain level, the cooling effect is limited. So to have best energy perfromance of the roof, than you need irrigation.


Response Jörg Breuning:

Thank you Jure.

My starting point of thoughts about irrigation on extensive green roofs goes back to a fundamental point and only a handful people make these considerations.

Humans are capable to replace nature with a manmade structure on any location on Earth and they make it suitable for people to live there. In these fundamental thoughts, I expect that humans are also able to create this lost part of nature on top of these structures.

I agree this is not always cheap and not everybody is blessed with creativity or experience. Nevertheless, it is possible and it is our responsibility if we respect nature.

The rooting depth of plants is certainly a key element - it isn’t a road block. It seems it is the preferred excuse that we don’t need to feel responsible in what we re doing and that we don’t feel guilty.

I also think it using water for cooling buildings in an open system (what any green roof is) is considered - in my world - using elementary, limited and precious resources for our convenience. In the case that producing water (in dessert states) for the wasteful irrigation of plants (to make our close environment nice) might be a problem to justify to more than 100 million people that have no access to dependable water resources.

What I am saying is, that growing plants even in areas where plants would hardly grow can be done with extremely low impact on natural, precious resources at costs that are lower in the short or long term. The current hype for green roofs can create significant drawbacks in 15 or 20 years from now to building owners if the costs of water continue to rise. Keep in mind a 20 year old green roof is not even the half of the life span of a green roof (at least that is what I know from experience).

Professionals need to start thinking long term and not for quick profit, they should disregard fancy fashions or get away from desperate LEED point collecting terms if they seriously respect nature. 

Jörg Breuning


Picture: Deep rooting plant on roof with hardly any soil and never intentially planted (in Texas at the border to Mexico).

Mineral Wool on Green Roofs

Green Team at Green Roof Technology, - Sunday, September 21, 2014

 Green Roof Innovation

 Mineral Wool on Green Roofs

 Green Roof Technology Reveals Latest Study about Mineral Wool on Living

Since their first commercial production in 1871 (Georgmarienhütte, Germany), mineral wool found its way in many applications like thermal insulation and soundproofing. Mineral wool, mineral fibers are typically referred to synthetic materials like fiber glass, ceramic fibers and stone or rock wool.

Two main types of mineral wools are on the market – water repellent (Hydrophobic) and water adsorbent (Hydrophilic). For horticultural purposes, only the hydrophilic type is useful. Many patents were granted for simple Hydroponic systems or the germination of seeds with mineral wool in the early 80’s.

In modern green roof technology the first green roof systems came on the market around 1985 in Germany at a time as the German green roof industry gained tremendous momentum. As a lightweight solution with high water retention, mineral wool seemed an ideal material. The higher costs and the higher carbon footprint - comparing to lightweight aggregates – were argued with easier installation and higher water retention.

Extensive research over more than 5 years at the University of Geisenheim and on numerous buildings confirmed the high water retention properties. However, in the mid-run these tests also revealed that the performance and the health of the vegetation were far below conventional green roof systems with standardize green roof components. Mineral wool manufacturers and green roof system suppliers stepped away from the idea of using mineral wool as a growing component for green roofs.

“Today we can see a revival of mineral wools in the green roof industry,” says Jorg Breuning, CEO, Green Roof Service LLC,” in countries with hardly any green roof experience, mineral wool is getting rather popular with potentially fatal results in the mid and long-run.” 

Especially in the United States, the market is growing rapidly for mineral wools on green roofs, disregarding existing studies and without extensive long-term tests. It isn’t even proven whether certain fibers can cause health problems, leach out chemicals or whether these components can be recycled when the green roof doesn’t perform anymore.

In 2012, the lack of performance of mineral wool as a vegetation carrier resulted in a major green roof restoration at Amsterdam International Airport. 90,000 square foot of green roof – built with mineral wool - had been taken off and replaced by a standardized green roof system. At this point, this was the largest green roof restoration in the history of mineral wool on green roofs. Costs that could have been avoided.

Doing it right in the first place.

Green Roof of the Year 2014

Green Team at Green Roof Technology, - Tuesday, September 09, 2014


Green Roof of the Year 2014 – 30 Years and Counting

The second oldest Green Roof Association* in the world, FBB (Fachvereinigung für Bauwerksbegrünung), awarded a prize for Green Roof of the Year 2014 to a 30 year old Green Roof on the Allianz Insurance Company in Stuttgart, Germany. Oldest Green Roof Association DDV (Deutscher Dachgärtner Verband).

The roof is one of the first projects where Jörg Breuning, CEO at Green Roof Service LLC / Green Roof Technology was substantially involved in the realization. Allianz Insurance Company decided in 1981 to build their local headquarters in the heart of Stuttgart. At that time the office building was already a big step forward for urban development in many regards. Along with very advanced, environmentally friendly technologies it was also one of the first buildings to achieve the split between living green working space and luxurious living in downtown of a large City. 

The Green Roof is generally assembled around the building and on different levels. Most people in the offices have a view into the green spaces.  Some areas of the Green Roof are accessible for coffee breaks and, on the highest floors there is usable garden space for the Condominium owners. The top floor even offers extensive lawn areas as playgrounds for kids.

All Green Roofs together measure over 21,000 sf. This inner city oasis utilized an advanced Optigreen Green Roof Systems with fully automatic high tide and low tide irrigation system in the mineral drainage layer. The plants “decide” when they need irrigation; no drop of water is wasted or can evaporate before reaching a plant. Neither a person nor electricity is needed to operate this fully mechanical system and it leaves enough room for precipitation to fill up the water storage under the plants. This green roof represents a smart combination of Blue Roof and Green Roof as Green Roof Service LLC / Green Roof Technology is still doing it on projects today. It is a foremost and 100% accurate irrigation system far beyond most irrigation systems that are operated by sensors, electricity, Apps, tubes, pipes or other highly vulnerable and expensive equipment  we see every day on projects in North America or around the world.  

The entire depth of this highly efficient Green Roof technology is approximately 18 inch and has allowed lawn, perennials, shrubs and small trees to grow for over 30 year without replacement or  changing out the growing media. 

Green Roof Service LLC / Green Roof Technology is proud of this Award and we are pleased to offer more information about it. We offer Green Roof tours for anyone interested in this kind of technology.

This has been a landmark project for more than 3 decades and we congratulate all who are part of this Award!

*Note: Oldest Green Roof Association in the world: DDV (Deutscher Dachgärtner Verband).

Green Roof of the year Green Roof of 2014 

30 years Green Roof / 2014  

 Picture 2013 Optigreen

Green (Roof) Washing

Green Team at Green Roof Technology, - Wednesday, June 25, 2014

Baltimore (I-Newswire) June 25, 2014 - Baltimore, MD. Green Roof Service LLC - Green Roof Technology offers the most reliable and cost efficient vegetated roof solutions to meet all challenges of growing vegetation on impervious locations. With efficient and ingenious solutions Green Roof Service LLC - Green Roof Technology successfully designed and engineered multi-million square feet of green roofs across Europe and North America since 1980. Their custom tailored design is even installed on 5 Celebrity Cruise Ships sailing around the world under permanent changing climate conditions.

"I have seen everything", says Jorg Breuning CEO at Green Roof Service LLC, "but what currently happens in the United States can be devastating for an entire industry". Green Roof Service LLC receives weekly calls from clients with green roofs that are not performing as promised.
All of these underperforming green roofs are designed and installed with a lack of experience at any stage of a project or they were compromised in the engineering or construction process.

Especially permanent installed irrigation on extensive green roofs (shallow, light weight functional roof for stormwater retention) is causing increasingly problems with maintenance and operational costs. "Permanent irrigated extensive Green Roofs should not get any incentives from Government, State or Cities", suggests Jorg Breuning. "They don't reduce the stormwater issues of human settlements and they require high amounts of nutrients that can also pollute our water ways."

Irrigated extensive green roofs are often recommend with expensive pre-vegetated green roof systems that are delivered in metal or plastic boxes (often called trays or planters) and then simply placed on a rooftop. "With these solutions and additionally combined with irrigation, sustainability goes literally down the drain," warns Jorg Breuning, "this is green (roof) washing for quick bucks".

Green roof Service LLC - Green Roof Technology introduced low impact modern green roof technology to North America based on experience and common sense. Their clients truly manage environmental issues without using precious resources, at incredible low operational cost and without any risk of failure.


Germany breaks 3 solar power records in 2 weeks

Green Team at Green Roof Technology, - Saturday, June 21, 2014

Germany breaks 3 solar power records in 2 weeks


More about the German record breaking Solar News at Treehugger

Since 5 years Green Roof Service LLC / Green Roof Technology is desperately trying to convince North Americans of the combination Solar and Green Roof.

Whether it is the world’s famous Universities, the world’s biggest corporations, the National Roofing Association or the Green Roof Association of North America, none of them seems the future of combined modern technologies.

Short term profits, ignorance and greed semm to blind North America - it isn't the sun blinding. These egoistic behaviors are reasons why North America is losing more and more ground in the technology sector, respect in the world and last but not least Millions of jobs.

I hope there is an App for it …. Well, without power it might not help.



Green Roof Revolution in Sydney

Green Team at Green Roof Technology, - Monday, April 21, 2014

By: Samantha Yurek

On April 7th, 2014, the City of Sydney, Australia approved a Green Roofs and Walls Policy. The Policy will be carried out by the Strategic Planning and Urban Design Committee of Sydney. A three year plan, its main goal is to raise awareness of the importance of green space in urban areas as well as promote the implementation of potential green roofs and walls.

                                   Pinpointing Green Roofs in the City of Sydney

Sydney is already in the lead of the green revolution, with a total of 83 green roofs and walls throughout the city. In addition, 50-70 likely projects have been approved to construction and should be underway soon.The Green Roof Meadow at the Prince Alfred Park Pool is one of the largest in Sydney. Complete with 2,000 square meters of green space, including over 35,000 seasonal and native grasses.

                            The Green Roof Meadow at the Prince Alfred Park Pool

The city is also home to One Central Park residential towers, featuring the world's tallest vertical garden at 33 stories. These gardens consist of 190 native Australian plants as well as 160 exotic species. Although it may not be the tallest for long - Shri Lanka is now in the running with plans to build a 46 story residential building, with multiple vertical gardens, proposed to be completed by the end of 2016.

                                        One Central Park Towers in Sydney

Lucy Sharman, Sydney's Green Roofs and Walls Senior Project Officer explains, "With higher-density living and a growing population, we need to accommodate people in a healthy way and use urban space as wisely as possible." And it seems that advocating for a greener city is working. "We receive more than one development application each week for a green roof or wall," says Sharman.

                                            One Central Park Towers in Sydney

The Green Roofs and Walls Policy isn't their only attempt to create a cleaner and healthier environment. The city has been working on many movements, such as 202020. Working towards 20% more green spaces in urban places by the year 2020. 

If you're interested in, you may check out the whole Green Roofs and Walls Policy here.

MD Bill 207

Green Team at Green Roof Technology, - Monday, March 31, 2014


Today I we received an email by the USGBC requesting to oppose the MD House Bill 207. In the last decades the USGBC grew dramatically. Beside their originally great intention, LEED increased the costs of buildings super proportionally to the benefits for the environment.

In our opinion it is now necessary to naturally develop sustainable practices, solutions and technologies that can be much easier adopted and implemented by environmentally conscious people. With very simple tools (“rain tax”, higher taxes on energy, and responsibility for costs to reduce the negative environmental foot print of buildings etc.) the government now has a great opportunity giving back to builders and building owners the freedom of making their own decisions without the overwhelming pressure and costs from LEED.

Bill 207 helps to increase environmental consciousness of all American individuals and gives them back their freedom and responsibility in making their own decisions.

What is described as a setback by the USGBC is just a desperate reflex and fear of losing revenue and influence. USGBC must learn this lesson and USGBC has to prove that they are still competitive once Bill 207 passed.  

If the USGBC can’t take this as challenge they are worthless to start with.  

We support MD House Bill 207

Green Roofs, Green Infrastructure in Lancaster, PA

Green Team at Green Roof Technology, - Wednesday, March 05, 2014

Going Green Will Save Lancaster in Controlling Storm Water

Release Date: 03/04/2014
Contact Information: David Sternberg, 215-814-5548

-New EPA Report Documents Savings-

(LANCASTER, Pa. – March 4, 2014) The U.S. Environmental Protection Agency (EPA) released a report today that found green infrastructure can be a cost effective solution to controlling stormwater while providing numerous economic benefits. Using the City of Lancaster as a case study, EPA sought to quantify the economic benefits associated with utilizing green infrastructure for controlling wet weather pollution.

Mayor Rich Gray

“Cities like Lancaster are leading the way in creating cost-effective and innovative solutions to the stormwater challenges we face today,” said EPA Regional Administrator Shawn M. Garvin. “By keeping rain water from coming into contact with pollution in the first place, green infrastructure improves water quality while making communities more livable.”

The report estimated that within the combined sewer system (CSS) area, Lancaster’s green infrastructure plan will reduce gray infrastructure capital costs by $121.7 million and reduce wastewater pumping and treatment costs by $661,000 per year. It will also provide approximately $2.8 million in energy, air quality, and climate-related benefits annually.

These benefits exceed the costs of implementing green infrastructure, which were estimated to range from $51.6 million if green infrastructure projects were integrated into already planned improvements to $94.5 million if green infrastructure projects were implemented independently.

"The City has invested more than $25 million over the past decade in ‘gray infrastructure’ improvements to increase the capacity of the City’s wastewater system,” said Lancaster Mayor Richard Gray. “In spite of this investment, a significant amount of untreated combined sewage continues to overflow into the Conestoga River and eventually into the Chesapeake Bay. Green infrastructure will help reduce the volume of storm water entering our wastewater system and, at the same time, transform the City into a more sustainable, healthy community.”

Unlike single-purpose gray stormwater infrastructure, which uses pipes to dispose of rainwater, green infrastructure uses vegetation and soil to manage rainwater where it falls. By weaving natural processes into the built environment, green infrastructure provides not only stormwater management, but also flood mitigation, air quality management, and community revitalization.

In 2011, the City of Lancaster released its comprehensive green infrastructure plan. Developed with the assistance of city, county, and state agencies, the plan identified opportunities for adding green infrastructure throughout the city within 5-year and 25-year timeframes; estimated the water quality benefits and articulated a series of policy, outreach, and technical recommendations for implementing green infrastructure in the city.

Because of the plan and the city’s interest in understanding the added benefits of green infrastructure, EPA selected the City of Lancaster to serve as a case study for calculating the additional environmental, social, and economic benefits.

“Valuing multiple benefits of green infrastructure ensures water management investments by the City will help beautify, provide a safer, healthier and more prosperous community,” said Liz Deardorff, Clean Water Supply director at American Rivers.
“The results of this study affirm that green infrastructure has multiple benefits for both large and small cities needing to reduce pollution and ensure clean water.”


Lancaster, like hundreds of other cities across the country, has both a combined sewer system (CSS) and a municipal separate storm sewer system (MS4). While the CSS collects both sewage and stormwater and conveys flows to a wastewater treatment plant, the MS4 collects only stormwater runoff and discharges flow directly to receiving streams.

The report summarized how installing green infrastructure in the CSS area could reduce gray infrastructure capital investments and associated wastewater pumping and treatment costs; as well as how installing green infrastructure in both the CSS and MS4 areas could produce a range of environmental benefits across the city.

A copy of the report can be accessed at this link:

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