The Extensive Garden Roof Assembly is ideally suited for locations that will receive little maintenance or where structural capabilities are a concern.

Unlike Intensive Garden Roof Assemblies, Extensive Garden Roofs are not intended for recreational use and are typically chosen for their appearance or to help reduce the "urban heat island" effect and minimize stormwater run-off. Extensive roofs only require a shallow growing media depth, generally as little as 3"-6" (depending on the region), and therefore add little weight to the roof structure below when compared to a standard ballasted PMR roof.

Recommended plant types for extensive roofs need to be drought, wind and frost resistant, such as self-generating sedums, herbs, grasses and other vegetation that can withstand harsh growing conditions.

The water stored in the growing media and drainage/retention layer is sufficient to sustain the drought resistant plants between periods of normal rainfall. Thinner assemblies and very lightweight growing media blends are available for Extensive Garden Roof Assemblies

* When additional mositure retention is required, the addition of Moisture Mat and Hydrodrain AL is available.

Moisture Mat is made from non-deteriorating fibers to retain additional moisture. When a moisture mat is placed directly over Dow insulation, Hydrodrain AL (an air layer) between the moisture mat and insulation is required. Contact Hydrotech for recommendations.

Features of the Extensive Garden Roof Assembly:

* Depth (3 - 6 of growing media)
* Reduce and delay stormwater runoff
* Help to mitigate the urban heat island effect
* Requires minimal maintenance
* Can be used on flat or sloping roofs
* Garden Tray GT15 available for modular applications
* Vegetation options - plugs, cuttings, InstaGreen Sedum Carpet or InstaGreen Sedum Tile

For more information, please visit http://www.hydrotechusa.com/assemblies/garden-roof-assembly