Green roof installation for stormwater management

Preparing for the Future, Despite Current Pandemic

Cape Cod Tech (north side) shows completed green roof with a wave of maroon pre-vegetated mats integrated with the green.

While the Covid-19 crisis has forced millions of students worldwide to work from home, a team of dedicated essential workers brave cold temperatures and nearly gale force winds to install the StormCap™ green roof system that helps the the new Cape Cod Technical High School prepare for extreme weather and climate change.

Dedicated Workers, Carefully Carry On

Pandemic and unseasonable weather aside, dedicated workers carefully carry on to meet summer occupancy deadlines.

Above all, to ensure everyone’s safety the local fire department took the temperature of each construction crew member at the start of the day. Furthermore, workers wore face masks, maintained health and safety measures and kept a safe distance throughout the day to complete the green roof installation as scheduled and help make this building more resilient to climate change in the future. With the vegetated roof, the building will better manage large rain storms and reduce runoff into sewers and reduce stormwater pollution.


Video of green roof installation

In this video, Stormwater Capture Co’s Rodney Chaney, shows part of the green roof installation process under Covid-19 measures.

Tech Innovation for the Region’s Tech School

The Cape Cod Technical School will be at the forefront of technological education in the region. Furthermore, its lucky students will be able to look out their window to see a 25,000 square foot green roof for a lesson in innovation and sustainable design. The StormCap™ system is a 4″ profile includes drainage, filter, retention, media and plant base. It weighs only 23 lbs/sf saturated and retains up to 1.59 gal/sf of stormwater. This innovative lightweight systems handles a 2.54″ rainstorm. Hence, reducing localized flooding. Its superior components include Knauf Insulation’s Urbanscape® needled mineral hydro blanket made of virgin rock fibre. This mineral wool uses no binders giving it superior retention of 90% of water by volume.

StormCap™ Green Roof System Benefits

The StormCap™ green roof offers a basket of environmental benefits to the building, its occupants and the wider community. Not only does it protect the roofing membrane, it may double its lifespan. A green roof helps save energy by keeping the building cooler. Even more, it offers students a close-up lesson on green infrastructure and sustainable design.

Cape Cod Tech’s south side side is visible to students and staff.

Cape Cod Tech Green Roof Facts

Developer: Colliers International

General Contractor: Brait Builders Corporation

Architect: Drummey Rosane Anderson, Inc

Landscape Architect: Warner Larson, Inc

Installer Team: Green Wood Industries was the roofer and a sister company The Waterproofing Company provided the installation team to complete the green roof phase.

Roof system: The StormCap Extensive Green Roof  System installed over a Saranfil 410 PVC which was vector mapped for leaks prior to the green roof install.

Green roof system is the StormCap™ 2.5+1 retention green roof.  This maximized the saturated weight of 23lbs and allowed for a nominal 4″ depth including drainage, filter, retention, media and plant base.  Vegetation will grow to an average 6-9″ depth.

Stormwater Capture Co supplies a range of systems from lightweight and biodiverse to detention green roofs.  Furthermore, sedum blankets and base layers are customizable to meet specific stormwater management goals and can easily be cut to fit any shape and design.​

For an estimate or design support for your project please contact Rodney at 855-786-7626 or

Urban Flood Image

Video explains innovation in rooftop stormwater detention

Watch the video at link below to compare traditional green roof systems to the StormCap™+Detention that delays runoff and reduces peak runoff intensity.

Urbanscape by Knauf Insulation logo

Ready to face second day and extra-large storms

The image conveys this system is powered by the Purple-Roof concept.

StormCap™+Detention, powered by the Purple Roof Concept and enhanced by Knauf Urbanscape® ‘s needled mineral wool, offers quick recharge hence facilitates repeat performance.

StormCap™+Detention: Delays and Reduces Peak Runoff Intensity

The StormCap™+Detention pre-vegetated system is an innovation resulting from decades of international experience and exhaustive green roof research.  StormCap™+Detention delays runoff and reduces peak runoff intensity thus complies with stormwater detention requirements for design storms.


Start your design!

Email Rodney Chaney, Technical Sales Manager or call 855-786-7626 Ext 6

Urban Flood Image

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Stormwater Capture Co. LogoStormwater Capture Co offers a single source solution for a complete green roof system package . We customize your system to local requirements and provide warranty and support.  We are a one-stop-shop supplying vegetated mats, high performing base layers, pavers and accessories.

20 Mar 2020

Dear friends,

As we all navigate the challenges posed by the COVID-19 pandemic, I want to reach out to let you know what you can expect from Stormwater Capture Co at this time.

We are taking all appropriate precautions for the health and safety of our employees, and we are fully operational and working as normal to help our customers with their green roof projects. From assistance with specifications and project requirements to ordering and delivery, we will continue to provide our top-quality service to our customers.

The current situation is constantly evolving, and  while we’ve taken all the necessary precautions at this time to work as normal, we can’t anticipate whether our business will be more directly affected by COVID-19 in the coming days. We will keep you informed in the event that we need to make changes on our end as things unfold.

We know that you may be making adjustments to how you’re working too, so we also want to remind you that you can reach Rodney Chaney, Technical Sales Manager at 855-786-7626 ext 6 or email

Thank you for your understanding.

Urban Flood Image

StormCap™+Detention Helps Mitigate Floods

StormCap™+Detention green roof system is engineered to optimize stormwater  management. It detention tool that mimics watersheds and aquifers to help mitigate urban flooding.

Lessens strain on sewers. 

Decreases combined sewer overflow (CSO).

Detention technology allows the green roof to face second day and extra large storms. It is not dependent on weather to provide a repeat performance and recharges in as little as a few hours.  StormCap™+Detention  stores water temporarily and limits the rate at which water flows from the roof drain.



Innovative Technology Mimics Nature

Friction in nature includes tall grasses in meadows, dense masses of reeds in wetlands, or layers of leaves on a forest floor. Friction-detention in

vegetated roofs is a technological innovation inspired by nature to achieve rooftop SWM in dense urban areas.

Contact us to help run stormwater calculations specific to your project.



Clear Return on Investment (ROI)

StormCap™+Detention provides a clear ROI by reducing or eliminating cisterns and bioretention facilities and freeing up valuable space for income-generating development. It even works on a sloped roof!

Stormwater management is unique to each project. Let us start the process and run project-specific calculations.  Contact us for more info.

Other Benefits

  • Provides better plant performance: StormCap™ retains almost double the water of traditional green roofs, and StormCap™+Detention retains about 10-20% more than that! This increases water availabilty for better plant performance.
  • Achieves sustainability goals: StormCap™+Detention is a great way for companies or buildings to show commitment to the environment.
  • Increases real estate values: Green roofs provide usable or visible amenity space that increases rents and real estate value. StormCap™+Detention further increases real estate value by freeing up land
  • Offers greater cooling benefits: All green roofs help cool the building, but StormCap™ and StormCap™+Detention improve cooling by providing more water for evaporative heat loss.
  • Extends roof lifespan: Green roofs buffer the roofing membrane from thermal flux. StormCap™ and StormCap™+Detention do an even better job of this for the same reason that cooling benefits are greater.

Superior Components, Powered by Urbanscape™

The engineered base layers include Urbanscape™’s needled mineral hydro blanket, made solely of virgin rock fibre by Knauf Insulation. This mineral wool has no binders and therefore has superior retention of 90% of water by volume and withstands freeze/thaw cycles.

Most of StormCap™+Detention’s base layers come in rolls that are easy to transport and install. It is a fully customizable system with biodiversity options.  And, can be cut in any shape or size to create logos or icons on the roof!


Construction Canada cover features image of green roof in urban core

  1. Read Technical Article

“Creating Friction in Green Roofs: Reinventing the Traditional Green Roof” 

by Sasha Aguilera and Brad Garner, Construction Canada, October 2019.

Contact us to help run stormwater calculations specific to your project.


Stormwater Capture Co is a one-stop-shop supplying vegetated roof systems customized to local requirements, with warranty and maintenance support. Offer analytical support such as ​stormwater calculations specific to location ​and building/roof type.

Case Study: How the StormCap System is rehabilitating an ailing green roof pioneer and improving functionality for years to come.

The StormCap System is enhanced by Urbanscape for superior stormwater management and plant health.

By Rodney Chaney

The Severn Bank green roof  in Annapolis Maryland (MD) was ahead of its time.  Like many building owners who needed an onsite stormwater solution, this green roof was intended to be a workhorse. With historic rainfall in recent years, it was starting to burn out in sections.  Stormwater Capture Co was invited to inspect the problem and offer a solution to improve its functionality and restore its beauty. Below is the full story about this traditional green roof, now transformed with the StormCap system enhanced by Urbanscape.

Black stallion profile standing outdoors on a cloudy and stormy day.

Green Roof Pioneer: The beginning

The 13,000 square foot Severn green roof sits atop of a four story parking garage connected to a five story office building.  Its primary purpose was to address stormwater management needs near the historic downtown area of Annapolis – likely one of the first in Maryland built for the purpose of managing contributing stormwater.  Tecta America a pioneer in North American green roofs was consulted and contracted to install the roofing and green roof.   Tecta America has diligently maintained the roof since.

Stormwater Workshorse

For years, the green roof had functioned as designed. This workshorse managed well over seven million gallons of stormwater and maintained a healthy plant palette that the owners in the adjacent offices would look upon with pride.  The amenity space within the green roof area has provided a place to enjoy lunch or take a call alfresco.

Fast Forward A Decade Later: “Houston, we have a problem”

The Severn green roof had been designed to accept the contributing runoff from nearly half of the adjacent 20,000 square foot building roof managing the anticipated rain event. It retained both precipitation and runoff.  This workhorse managed twice the amount of water that fell directly on it. It was a great setup and worked beautifully for over a decade. Then, something happened…

Dealing with Historic Rain Events

Two exceptionally wet summers appeared to have caused the green roof to die in several significant areas. This was confusing as two wet summers should not have been enough to make the roof fail. After all, it had been designed to withstand a good bit of runoff.

In the last several years the region has seen historic rain events.  Many site stormwater management systems and municipal storm sewers have

Although many areas of the green roof were lush with excellent coverage other areas had almost completely burned out and in need of rehabilitation.

been overtaxed.

What went wrong and how to fix it?

As symptoms became apparent the owner and Tecta America were quick to act.  Stormwater Capture Co was asked to provide 3rd party consultation.  At the initial inspection, we were surprised to discover that although many areas of the green roof were lush with excellent coverage other areas had almost completely burned out.  What had gone wrong and how could we fix it? Upon closer inspection, we found several contributing factors.

Green roof with wet feet

The overflows designed to manage the onslaught of heavy flow from the contributing roof area hadn’t provided the fail-stop to keep the roof from “bogging out” for extended periods.   Even with a record of 7”+ rain events there was no evidence that the excess flow was reaching the height of the collar to allow for bypass.  Compounding the problem, the drainage assembly at sumps had been built at a time when drain perimeters weren’t typically installed.  In addition, the biomass of over a decade had accumulated to a point where the additional mechanism of evaporation was slow to dry.  While biomass is good, with these other factors this green roof was left with prolonged periods of “wet feet”.

If the green roof needed to manage only the water falling on it, this system would likely have continued to thrive.  However with this pioneer in contributing drainage, it was necessary to move the stormwater throughout the system more efficiently.

StormCap improves roof functionality and restores beauty

To remedy the problem, six hundred linear feet of perforated drain tile was trenched throughout. The indirect pattern allow for improved movement of water to all areas of the green roof.  Then eight expanded drain sumps were opened and framed with new SCC .063 perforated metal edge, SCC drain board, and ballast. Following this, the overflow on the “high side” of the green roof was adjusted by lowering the bypass collar height.  It was factored that 99% of rain events will be treated by the green roof.  So, even in heavy rain events the overflow won’t be tripped too often.

Upon our inspection, we found that only 3,000 square feet out of the total green roof footprint needed replacement.  This was the center of the green roof that received  the majority of contributing drainage.  We decided to solve this problem using several methods.

StormCap berm hosts deeper rooted natives and adaptives such as rudbeckia, asters, beards tongue, russian sage, lavender, phlox and babtisia.

Re-using Native Plants

After removing 3,000 square feet, we were able to reuse all of the nutrient rich biomass that had been built up over the past 12 years to build semi-intensive berms to harbor some deeper rooted natives and adaptives such as rudbeckia, asters, beards tongue, russian sage, lavender, phlox, babtisia, etc.

Not only did this reuse the existing material and help manage the excess of stormwater from the impervious deck area, it also created a great sightline from the amenity area that didn’t exist before.

StormCap Pre Vegetated Roof SystemStormCap Solution

The removed area was replaced with a high efficiency StormCap 1+3 profile by Stormwater Capture Co. Our proven assembly, consisting of  UrbanScape’s® high-performance needled mineral hydro blanket topped by our pre-vegetated mat, provides a healthy and instantly green roof .  This innovative systems now provides the retention needed and stormwater flow necessary to avoid “the bog” that was causing parts to die out in recent years.

Green again! 

After a few days of prep and a Saturday installation, the result amazed the owners Monday morning when they arrived to work.  Their green roof was in fact GREEN again!  The instant coverage of the sedum mat and the addition of the semi-intensive berms surrounding the amenity space were striking.  Less noticeable but more important than the “instant” coverage was the fact that the green roof will now manage stormwater more effectively and be ready for the sunny days well as the storms ahead.

Proud Green Roof Owners

The functional upgrade, and the addition of new visual interest, gave the owners a greater appreciation of what a healthy green roof can provide environmentally and emotionally.  In this scenario, we were able to solve a problem, add functionality, as well as provide a great new aesthetic to this existing “workhorse” green roof.

Your Green Roof Specialist / Design Consultant / Maintenance Support

Stormwater Capture Co offers a single source solution for a complete green roof system package such as the StormCap system. We are a one-stop-shop. Supplier of vegetated mats, high performing base layers, pavers and accessories.  We customize the system to local requirements and provide warranty and support.

Contact us for more info or a free quote on your upcoming project.


22 Mar 2017
green roof systems

Launching advanced solutions:  Innovative rooftop technology for Designers, Landscape Architects, Engineers and Building Owners


NEW YORK, USA, March 21, 2017 / — In recent years, flooding has occurred more frequently affecting a broader range of communities than ever before. Dense urban development, aging sewer systems and increasingly extreme weather are some of the main causes – calling for increased on-site stormwater management. The Stormwater Capture Co™ crew is on top of it with rooftop solutions to reduce the impact of major rain events on your building, your city and neighboring watersheds.

With deep roots in vegetated roofing, the Stormwater Capture Co™ team delivers breakthrough products that will help achieve results. The goal is simple: To be the “go-to-single-source-solution” for the complete system package, to certify and train qualified installers and to demystify green roofing for owners and designers alike.

“Whether it’s a second level rooftop garden, a 10th floor amenity space, or a non-accessible rooftop on the 25th story, there is a vegetated roof solution for almost every building. Our team simplifies the task of choosing the right vegetated roof for your building,” said Richard Aronson, General Manager at Stormwater Capture Co. “With a wealth of experience in our field, our team provides specialized technical and design consulting, as well as a high level of customer support whether it’s for bid package preparation or on-going maintenance. We pride ourselves as being a one-stop shop where you get everything you need in a greenroof, and nothing you don’t.”
Capture Rainwater On Site: Start With Your Roof

One of the products offered is the StormCap™ system, a high performing, easy to install green roof enhanced by Urbanscape®’s needled mineral hydro blanket. Manufactured by Knauf Insulation, the hydro blanket offers superior water retention making it ideal for vegetated roofs, as it is lightweight, can supplement or, in some cases, replace heavy growing media and can act as a water reservoir and support plant health.

During a major rain event, the StormCap™ system will retain 2.6″ of rainfall or 1.6 gallons per square foot. StormCap™ is also easy to cut and fully customizable.

With premium base layers, the StormCap™ system contributes to 8 additional LEED points in the following credit categories:

• SS – Site Development Protect or Restore Habitat; Open Space; Rainwater Management; and, Heat Island Reduction
• EA – Optimize Energy Performance
• MR – Environmental Production Declarations
• EQ – Thermal Comfort; Acoustic Performance


Custom Feature: Biodiversity

A perfect addition to the StormCap™ vegetated roof is the BioPocket™, a custom feature that provides an island of biodiversity and enhanced aesthetics where you want it. Working like a butterfly or bee island, the BioPocket™ is used to create a berm, or knoll, on your green roof to provide habitat and food for pollinators. The BioPocket™ brings a burst of color, perennials or grasses and is placed on various depths of growing media, depending on the building load capacity and your design goals.

A perfect addition to the StormCap vegetated roof is the BioPocket™, a custom feature that provides an island of biodiversity and enhanced aesthetics where you want it.

Control runoff under patios, walkways and fire-free zones

Walkways can also be designed to help absorb rainwater using the innovative SpongePaver™ System which incorporates the needled mineral hydro blanket with a drainage mat under a traditional paver. This offers a unique solution to control stormwater runoff on the rooftop.

The SpongePaver™ System incorporates the needled mineral hydro blanket with a drainage mat under a traditional paver to help control runoff under rooftop patios, walkways and fire-free zones.

Stormwater Capture Co serves the Great Lakes region and the rest of the north eastern United States, helps meet your goals whether the roof is a leading edge award-winning design or best value-for-money. Come meet us at the North/East Roofing Contractor’s Association (NERCA) Annual Convention and Trade Show, March 28-31, 2017 in Atlantic City, N.J. where samples of the StormCap™ system and the BioPocket™, among other products, will be shown.