Extensive garden roof from American Hydrotech
Extensive garden roof American Hydrotechwww.hydrotechusa.com Helps mitigate "urban heat island" effect and reduce stormwater runoff - Requires only 3 to 4 inches of growing medium and weighs 18 to 34 pounds per square foot when wet - Can be used on flat or sloping roofs - Rubberized asphalt roofing membrane produced with minimum 25 percent recycled content