Stevens Roofing Systems brings its vast experience in containment membranes, roofing construction and European green roofs to the United States with the introduction of the Stevens GardenTop™ System. The Stevens GardenTop™ System combines superior roofing membrane, insulation components and water management technology to deliver maximum performance, design flexibility and installation efficiency.

Worldwide Proven Performance

Europe has led the world in refining and modernizing green roof technology and has thousands of green roofs installed throughout the continent. Together with our European partners, Stevens has been active in the vegetated roof business for over a decade. Many of our European installations would not be possible without conformance to government standards for green roof applications. One of them is the German “FLL” test for evaluating a waterproofing membrane’s ability to resist vegetative root growth. Stevens EP™ membrane has successfully passed the stringent criteria of that program.

Green Garden Roof Benefits

A green roof delivers many benefits to the building owner and surrounding community. Studies worldwide have clearly demonstrated that these roofs make a positive impact on their local environment that ripples through the larger eco and economic systems they affect. The results show vegetative roofs help to clean the air of particulate matter; create habitat areas for indigenous wildlife; provide aesthetic appeal to surrounding locations; reduce the urban heat island effect prevalent in many metropolitan areas and control storm water run-off.

Stevens GardenTop™ Roof System Overview

There are two Stevens GardenTop™ System options: intensive and extensive.

The difference between the two is the depth of growing medium contained in the system. An intensive system, or “deep” system, has soil depth greater than six inches. The extensive system uses less growing medium, between two and six inches, to support its plant life.

Both systems provide a wide variety of benefits. The deeper soil depth of the intensive design supports a greater variety of plant life but demands increased structural load carrying capacity and greater sophistication in design, construction and maintenance. By using less soil in the extensive design, more building structures with modified “conventional” roofing assemblies and simple drainage systems can be fitted with vegetated roofs. Stevens has designed both systems for installation with our Stevens EP™ or Stevens EV® membranes, complimented by a full line of accessory products that complete the Stevens GardenTop™ assembly.

Stevens GardenTop™ Extensive System Description

An adhered roof assembly is the basis of the extensive system. High density DensDeck® Prime Roof Board provides a durable substrate for the membrane.

Stevens GardenTop™ Drain is placed on the membrane to provide: a high volume exit for water, reservoirs for water retention and an EPA certified fabric that protects against root intrusion. The shallow growing medium and plantings complete the extensive system.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stevens GardenTop™ Intensive System Description

The intensive system places the waterproofing membrane directly over a high load capacity roof deck and the remaining system components, such as the insulation and drainage system, between it and the growing medium. High density, closed cell insulation is used. A Stevens GardenTopTM Drain multi- component drainage system facilitates the vertical and horizontal flow of water through the roof assembly to the roof drains and provides air movement across the membrane surface.