American Hydrotech, Inc.,
303 E. Ohio Street, Chicago, IL 60611
Phone: 800-877-6125 Fax: 312-661-0731

Extensive Assembly

An extensive Garden Roof® uses a select range of hardy plants, making it attractive to look at while requiring little maintenance. Extensive green roofs are not intended for recreational use, but are usually 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” - 4”, and therefore add little weight (typically 18-34 lb/sf wet weight) to the roof structure below.

Features:

• Are lightweight with only 3” - 4” of growing media
• Ideal for inaccessible roofs
• Can be used on flat or sloping roofs
• Reduce stormwater runoff
• Help to mitigate the urban heat island
• Require minimum maintenance

The water stored in the growing media and drainage/retention layer is sufficient to sustain the drought resistant plants between periods of rainfall. Irrigation systems are not normally required except in extreme climates.

Extensive green roofs can be applied to flat roofs and sloping roofs with a pitch of up to 12:12 or 45º, provided the appropriate measures are taken to cope with the shear forces and soil retention. Please contact Hydrotech for additional information regarding sloped applications.

Click on a picture below to view Extensive Garden Roof project photos

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Inst. Advanced Studies - NJ