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FLL Revisited

Green Team at Green Roof Technology, - Tuesday, February 07, 2012

By Andrew Yanders

Edited by - Kat Harrold

Photo ~ Jorg Breuning

The FLL Green Roofing Guideline first appeared in 1982 as the “Principles of Green Roofing” and since 1992 has been reworked many times as “Guideline for the Planning, Construction and Maintenance of Green Roofing – Green Roofing Guideline.”  It is recognized as the benchmark set of regulations for green roofing in Germany.  The FLL Roof Greening Guideline is also widely accepted abroad and serves in some neighboring countries as the basis for developing their own regulations.

This latest edition covers the 2008 edition of the FLL Green Roofing Guideline.  The preface clearly states the importance and relevancy of the Guideline and the constant diligence taken to adapt and outline the newest developments in the green roofing industry.  The Guideline is the result of unpaid technical and scientific cooperative work and is intended to be a recognized code of practice or State-of-the-Art; it is a basic tool for the planning, construction and maintenance of reliable and high quality performing green roofs.  The Guideline also includes transparent, consumer oriented testing methods for the investigation of vegetation, substrates and aggregate drainage materials and the investigation of resistance to root penetration of roof membranes and protective layers. 

Three sections of this paper provide a brief summary of the three major components of the Green Roofing Guideline:  Planning, Execution, and Maintenance.  It is important to note that the Guideline requires a fundamental background in horticultural science and engineering principals.  The Guideline is not an IKEA step-by-step construction manual designed to enable any Do-It-Yourself project. 

Click here to read the full version.

IDS 2012 - Interior Design Show in Toronto Rolls Out the Emerald Carpet

Green Team at Green Roof Technology, - Wednesday, February 01, 2012

By Kat Harrold

IDS Show Floor ~ Photos by Jorg Breuning

Green Roof Technology is back from the premier interior design show in Canada IDS 2012.  At this show we were presented with the design challenge, "How do you live urban?" and responded with a challenge of our own, "How do you make the urban environment alive?" 

One of the most obvious and easiest ways to add green to the urban environment and make it come a live is to create a balcony garden or balcony green roof.  Where ground space is limited or not available at all, a balcony garden is the perfect solution for that green transition from inside to out.  Depending on your space, a green roof may be an easy low maintenance option.  For a more formal effect planters can be used to add a splash of color and create a dynamic space with height and texture.

For making a seamless transition from the outdoors in a green wall offers a compact and space saving solution.   Tropical plants offer a full pallet of color, shapes, and textures making even the bleakest winter days feel bright and lively.

During the warmer months or for a hotel lobby, a moss wall is a great alternative to a regular cement wall.  Studies have shown that the color green helps people relax which can often be a difficult achievement in the stress filled urban environment.  Meditation aside, the quality of air will be increased due to the filtration qualities of the vegetation. 

Vegetation, water, and fire all add exciting elements to our environment.  Some are green in color and others are green in function.  When selecting a fire feature, fountain, or green wall consider the carbon foot print of the feature.  Woodless fire pits are green alternatives just a closed system vegetated walls are the greener solution for irrigated green walls.



IDS 2012 - Interior Design Show in Toronto Goes Green

Green Team at Green Roof Technology, - Monday, January 30, 2012

By Kat Harrold

Photo by ~ Jorg Breuning

Four days and nights Canada's elite designers graced the halls of the Toronto Convention Center for the 2012 Interior Design Show.  Exhibitions of conceptual and ground breaking designs in interior design and industrial design challenged the we live and create the space around us.  While going green has come into vogue in the design world, none showcased this concept better than Green Roof Technology.  

In collaboration with Jill Greaves Design, Green Roof Technology created a seamless transition from the comforts of the interior space to the interactive green space of the urban balcony.  The green roof balcony featured a lush sedum carpet of blues and greens accenting the simple yet elegant lounge and table by Avenue Road.  The design is a perfect marriage of form and function creating a place of beauty for relaxation with the environmental benefits of a green roof. 



The Unheard Conversation Between Noah and God

Green Team at Green Roof Technology, - Wednesday, January 18, 2012

By Kat Harrold

The ‘Sun-Root’ Living Roof System—Green Roofs embrace Renewable Solar Energy

Green Team at Green Roof Technology, - Friday, January 13, 2012

Green Roof Technology today announced the ‘Sun-Root’ solar-living roof system, the first fully integrated, non-penetrative solar and extensive green roof system in North America.  The ‘Sun-Root’ living roof system is the most advanced green roofing technology available on the market.  The ‘Sun-Root’ living roof system was unveiled for the first time in North America on November 30, 2011 at Cities Alive 2011 in Philadelphia, PA.    

Green Roof Technology has been at the forefront of green roof innovations for over three decades and remains the leading authority on green roofs in North America.  With unsurpassed experience, Jörg Breuning, Principal of Green Roof Service LLC, and his dedicated team of green roof experts are proud to once again push the North American industry to new heights.  

“The ‘Sun-Root’ living roof system is a breakthrough in green technology,” said Kat Harrold, Green Roof Technology’s senior green roof designer.  “The combination of solar and green roofing technologies produces a harmonious system that benefits each technology equally.”  

The ‘Sun-Root’ living green roof system optimizes photovoltaic (PV) element energy production by creating a cooler surrounding micro-climate through evaporation and evapotranspiration.  “Heat is the enemy of energy production.” said Jörg Breuning.  “Any time atmospheric temperatures on a roof begin to rise PV elements lose their efficiency and can shut down if temperatures rise too high.  We sought a way to counteract this negative phenomenon by combining solar modules with an extensive green roof.  People have been using green roofs for centuries to keep their roofs cool in the summers and warmer in the winter.  It was a no-brainer combination.”

The ‘Sun-Root’ system officially goes on sale January 13, 2012 and is exclusively sold through Green Roof Technology’s website, or by phone at 443.345.1578.   

A video demonstration of the Sun-Root™ System

Chimes Solar Plan Needs Better Location

Green Team at Green Roof Technology, - Wednesday, January 11, 2012

By Andrew Cole Yanders

Photo by ~ Jorg Breuning

There is undoubtedly an unpleasant knee-jerk reaction whenever you hear someone criticize a NGO whose sole purpose is to provide humanitarian assistance to people in most need.  We all admire their work and generally feel better about living in a community who supports them and their activities.  So when the The Chimes, a Dixon Hill-located nonprofit, announced at a community association meeting their desire to install an array of ground-mounted solar panels on their property, the opposition to their plan may seem harsh and unwarranted.  The Chimes is an admirable organization whose commitment to cleaner, renewable energy should be above repute.  Every intention in The Chimes’ plan is correct, except for the location of the solar panels.  

Residents were right to question the location of the panels and infer the detrimental effects they would have on the landscape if they were installed.  Installing a ground array of solar panels is completely counter-productive to the intended goal of good stewardship of the neighborhood.  This type of system replaces a functioning ecosystem, which provides the life essential mechanisms of oxygen production, pollutant remediation and stormwater mitigation, with a clear-cut lawn that exacerbates stormwater runoff.  Removing trees and other plants from the area will only intensify the stormwater runoff from the site and overwhelm existing measures to deal with the stormwater problem.  Any storm damaged trees that must be taken down should be immediately replaced.  

If the ground is not a suitable location for the panels then The Chimes should look to the roof tops for a suitable location for their panels.  Most of the homes in Baltimore’s oldest suburban neighborhood are not a suitable location for solar panels, but any buildings in the neighborhood with a flat roof are an ideal location.  Located very nearby on Thornbury Road is such a building.  The building on Thornbury Road is an ideal location to install a solar living roof.  The combination of high-efficiency solar panels with an extensive green roof enables The Chimes to produce clean, renewable energy as well as help alleviate the stormwater runoff problem affecting residents lower down on the hill.

Necessary Winter Maintenance for Green Roofs

Green Team at Green Roof Technology, - Friday, January 06, 2012
By Andrew Cole Yanders



A diligent maintenance schedule is a principal we take very seriously.  Without proper maintenance a green roof has no chance of thriving and looking its best.  There is even serious threat of long term damage to the underlying roofing materials when maintenance is neglected.  There is even a likelihood of an overall failure of the roof’s main purpose, to keep the building’s interior dry.  Because of the grave consequences of not properly maintaining a green roof we continue to insist on a strict maintenance schedule with all our clients. 

Here in the Northeast of the United States winter is upon us and we are eagerly awaiting the first blanket of pristine white snow.   There are 4 key maintenance aspects we wish to highlight that are essential for the health of the roof during the winter season.  

1.    Clearing Drains & Gutters:
Clearing roof drains and gutters is important all year round.  During the winter months moisture accumulates in large volumes on your roof and when the snow and ice melts it places a particular high level of stress on the waterproofing.  If the drainage system of the roof is not operating efficiently, water will find its way through the weakest points of the waterproofing.

To maintain a properly draining roof, roof drains and gutter must be inspected and all debris removed, especially if the green roof does not have inspection boxes.  Because drains without inspection boxes are much more prone to clogs, we believe inspection boxes are absolutely necessary for any green roof system.  

2.    Snow Removal:

Similar to any typical roof, when snow begins to accumulate heavily on a green roof make sure it is evenly spread out; snow drifts should be mitigated to avoid exceeding load limits.  

In areas where snow accumulation on the roof is a hazard particular attention must be made not to damage the green roof during snow removal.  So far as we know, there has been no literature on this subject and no recommendations have been made.  We are recommending a 4 inches, 20 cm, buffer layer of snow.  To remove any more snow allows for the potential to disturb plants and dig into the growing media.   

The best method for removing snow from a green roof is to shovel the snow onto a blanket and drag it over to the edge of the roof, always remembering to leave of 4 inch layer of snow over the green roof.  


3.    Waterproofing:

The early months of the winter is a good time to check the nooks and crannies of your roof’s waterproofing.  Check the caulking and look over all the access areas and make sure they are all sealed properly.  Additionally, before any snow has begun to accumulate on the roof, check all areas of the green roof for wind or water erosion.  Alleviating these problems areas in the winter allows for rapid vegetation covering to occurring in the spring and protects the waterproofing layer from any deterioration due to exposure to the elements.  

4.    Pruning & Cutting Vegetation
We are never pleased when grasses are cut in the fall or early winter.  Besides providing a decorative look to an otherwise dormant field, leaving the dry seed stalks provide protection for the core of the plant and its new growth.  

Green Roofs vs. Reflective Roofs

Green Team at Green Roof Technology, - Friday, January 06, 2012

By Kat Harrold


Photo Courtesy of A3C

There are a number of debates swirling around the roofing industry these days, possibly none more so than the green roof versus reflective white roofs debate.  Numerous factors go into the decision making process when deciding which roof best suits your needs.  Short term cost is a no-brainer discussion, but the environmentally friendliness and long-term investment debate is a bit more complex.

The environmentally friendliness debate is typically discussed within the context of energy savings and heat-island mitigation.  To accurately assess the differences in energy savings between the two roof types for a specific building a mechanical engineer, who is familiar with the thermodynamic properties of the various layers of green roofs and how they work together with the existing building, would need to be consulted.  However, to gain a general idea of what temperatures are at play, below are graphs showing the differences in temperature on various types of roofing surfaces.



The illustrations above show that the green roof is the most even keel choice out of the group, providing heat insulation during colder temperatures and cooling the roof during the warmer periods.  As shown above, a cool roof provides more cooling effects than a regular tar roof; however, it is still considerably warmer than the green roof during the warmest times of the day.   Conversely, the cool roof is the coolest of all the roof types when the temperature dips.  

You might say to yourself, “Well the cool roof may not be as effective temperature wise as a green roof but it’s cheaper.”  Wrong.  While the initial installation of a cool roof may be cheaper than that of a cool roof consider this; according to “Green Roofs vs. Cool Roofs” in March 2011, cool roofs may reflect up to 90% of the sunlight the first year however it quickly loses this capability to only about 70% from UV damage, pollution, dust, and exposure to the elements unless meticulously cared for.

The other price tag to examine is a cool roof like any other regular roof will need to be replaced after about 20 years.  A properly designed and maintained green roof should last 50 years or more.  Consider this the next time you need to re-roof.  

Green Washing

Green Team at Green Roof Technology, - Wednesday, January 04, 2012

By Kat Harrold

IDS12: Toronto Interior Design Show 2012

Green Team at Green Roof Technology, - Monday, January 02, 2012
By Andrew Cole Yanders

Photo Courtesy of

The party begins on January 26.   Toronto’s largest contemporary design fair kicks off with a party Thursday night with local DJ Karim Rashid spinning tracks.  The 4 day event will showcase the best and brightest from Canada’s flourishing design scene.  In addition, leading designers from all corners of the world will be exhibiting their newest creations.  Green Roof Technology has the special privilege of collaborating with Jill Greaves Design to create a stunning rendition on ‘How do you live’?  The exhibit will focus on the style of urban living.  Where green is the new black, green roof technologies will be taking center stage as the latest in eco-chic. 

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