the Green Roof Patroller (February, 2013), was born in the
"green roof capital of world." He began working with green roofs in Stuttgart, Germany in 1980. Since then, he has installed and maintained tens of millions of square feet of green roofs throughout the world.
In 2003 Jörg transferred his German
company (founded in 1985) to the United States after being the key consultant for Chicago’s City Hall green roof. His company, Green Roof Service LLC (Green Roof Technology), has introduced numerous innovations to the North American green roof industry. Jörg’s articles will strongly focus on topics that ensure common sense is always practiced, ensuring that the horse stays in front of the cart, and provide valuable insights into making green roofs as popular and efficient as they are in Europe.
In 2002 the USDA (United States Department of Agriculture) initiated a project with the American Horticultural Society (AHS) to update the 1990 USDA Plant Hardiness Zone Map.
A year later the AHS released a draft of the update version which showed that many of the hardiness zones had moved northward reflecting a general warming trend.
The USDA, after a brief review, decided to reject the draft and gave little justification for its decision. Its terse dismissal raised the possibility that it was a political decision - the USDA was concerned that the AHS Draft gave support to global warming proponents and decided to suppress the project to avoid controversy and not embarrass the Bush Administration...
Mineral Wool on Green Roofs – Chance or Challenge?
By Jörg Breuning,
the Green Roof Patroller
September 30, 2014
Graphic by Jörg Breuning.
Mineral wool (also known as stone wool, rock wool, and glass wool), mineral fibers, or man-made mineral fibers are products made from natural or synthetic minerals. The term "man-made mineral fibers" is generally used to refer solely to synthetic materials including fiberglass, ceramic fibers and stone wool. Since their first commercial production in 1871 (Georgmarienhütte, Osnabrück, Germany), mineral wool found its way in many applications such as thermal insulation (as both structural insulation and pipe insulation), and soundproofing. Patents in this regard date back to the 1930's. The hydrophobic properties of mineral wool make it ideal for building products.
Much later hydrophilic mineral wool was developed for
controlled horticultural purposes like germination of
seedlings or simple hydroponic systems for vegetables.
Hydrophilic mineral wool has very high water retention so it
was no surprise that this specially prepared mineral wool
came to the attention of the German Green Roof industry in
Energy Cost Savings through Green Roofs – a Myth
By Jörg Breuning,
the Green Roof Patroller
June 28, 2013
is unavoidable and just common sense that wearing wet
clothes in winter will end up in hypothermia. Wearing
the same wet clothes on a hot summer day, however, might
help to feel cooler – but do not get confused with feeling
more comfortable. If we have only one set of clothes,
all season clothes, these are typically made of two layers.
The first layer protects against direct environmental
impacts like direct sun light, rain or wind, and the second
layer usually consists of a breathable layer for comfortable
wearing and controlled air circulation.
I have learned
on my travels all across different desserts on Earth that
these layers reduce temperature increase on hot sunny days
but at the same time they reduce the body heat loss during
extreme cold nights. Indigenous people of extreme
environments have learned this lesson over centuries and
were able to survive under these extreme conditions with
this simple layer strategy. My dad used to say: “What
is good for the cold is also good for the warm.”
Any man-made building is nothing else than a body that
requires consistent “body temperature” to make it usable for
the purposed design. A building without reliable
all-season clothes is worthless or requires a tremendous
effort (energy or operating costs) to make it useful...
Publisher's Note: For
an in-depth look at greenroofs and energy, please revisit
Green Roof Energy Series (PDF) by Greenroofs.com
Contributing Editor Chris Wark.
Contact Jörg below with your commentary.
Irrigation on Extensive Green Roofs - Facts Study
By Jörg Breuning,
the Green Roof Patroller May 31, 2013
The main purpose of an extensive green roof is stormwater retention and delaying stormwater runoff amongst many other added values.
A permanent irrigated extensive Green Roof with sprinklers – most inefficient and most plants' destructive solution. Photo: Jörg Breuning
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...
Publisher's Note: Contradictory opinions abound on this subject - please discuss and add your opinions
here! Email us at:
email@example.com and/or contact Jörg below.
Cool Roofs are not Green Roofs
By Jörg Breuning,
the Green Roof Patroller Inaugural Contributing Editor Column March 4, 2013
In Physics class we learned basics about thermodynamics and about thermodynamic equilibrium. In simple words the content of a black coffee mug “adjusts” faster to the surrounding temperature than in a white coffee mug assuming the material and material thickness of the mugs are the same.
Source: Labor für Bausanierung & Energieeffizenz, Berlin
Exposing these mugs to the sun light the black mug will
convert the electronic energy (sun light) into heat faster
and no light or shade cools it faster assuming the ambient
temperature is lower. The physics behind converting
light into heat is called...
Jörg was born in the green roof capital of world. He began working with green roofs in Stuttgart, Germany in 1980. Since then, he has installed and maintained tens of millions of square feet of green roofs throughout the world.
Remember, everyone, that English is not his mother
During his career Jörg has earned multiple degrees and certifications in landscaping, horticultural, and green roofing. In January 1983, Jörg Breuning was one of the first people in the world to earn a green roof professional accreditation from Optima, now Optigrün AG, who were the first green roof manufacturer to offer an in depth educational system for the installation and maintenance of their products. In order to be eligible for the accreditation, a candidate had to have completed 3-years of apprenticeship with a certified landscaping company. In 1985 he earned his national certification and horticultural technician degree – a program of work and study that required 5-years of practice in an approved landscaping company and 4 semesters of University study.
In 2003 Jörg transferred his German Company (founded in 1985) to the United States after being the key consultant for Chicago’s City Hall green roof. As an experienced horticultural expert, he has been able to educate many of North America’s green roof pioneers, providing them with fundamental green roof knowledge to start and grow their own businesses.
His company Green Roof Service LLC (Green Roof Technology) has introduced numerous innovations to the North American green roof industry. Many of these innovations have been adopted by companies such as Roofmeadow, Emory Knoll Farm, GAF, CETCO, Rooflite, Green Roof Solutions, Celebrity Cruises Miami and Optigreen.
Jörg’s articles will strongly focus on topics that ensure common sense is always practiced, ensuring that the horse stays in front of the cart, and provide valuable insights into making green roofs as popular and efficient as they are in Europe.
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