Seed blanket for Extensive Green Roofs
Green roofs provide many benefits, e.g. storm water runoff reduction; increase insulation properties; reduce heat island effect through evapotranspiration. Although more and more new real estate have a (mandatory) green roof, many old roofs in urban areas remain with a classic roof, as green roofs are heavy systems, not easy to install and relatively expensive.
To lower threshold for consumers and to accelerate the transition to more green roofs in historic urban areas, we offer a lightweight, easy-to-install green roof system that is cheaper than current extensive green roof build-ups, by 1) using cost effective build-up materials and 2) saving money on transportation and installation cost (even suitable for DIY).
ProSystem prototype demonstration in operational environment.
Prototype near or at planned operational system. Represents a major step up from TRL 6 by requiring demonstration of an actual system prototype in an operational environment.
Prototype near or at planned operational system. Represents a major step up from TRL 6 by requiring demonstration of an actual system prototype in an operational environment.
The build-up system has been defined. A successful test set-up in western Europe, ideal conditions (mild temperature and humidity) installed. More testing required in other regions (e.g. south and continental Europe) to validate it can be successful across Europe.
How does it work?
The product is an extensive green roof system which consists of a Drainage layer; Growing medium; Composite Seed blanket and Ballast. Apart from the ballast, all layers of the system are sheets or blankets rolls. All materials are dry, and can be stored for a long period. The seed blanket is an unvegetated composite, which contains a sedum seed mixture that can be customized to withstand different climatological conditions. This allows potential use across Europe. By using geotextile as growing medium, additional substrate is not required. With a weight of ±53kg/m² the system is very lightweight compared to standard extensive green roofs(>100kg/m²). Current system retains 25L/m², which can easily be increased using alternative geotextiles.
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