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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


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