Over 15 Million square feet of Green Roofs in 2 days!
In the World’s Green Roof capitol it isn’t a problem to walk over 15 million square feet of Green Roofs in two days.
Grinnell College Students, Architects and Professors joined me this year on a two day trip though out Stuttgart Germany.
Within the city limits and a population of around 700,000, Stuttgart can offer likely over 200 millions square feet of extensive and highly divers Green Roofs – more than the entire USA and probably Canada together.
The two days tour emphasized Green Roofs that are between 15 and 30 years old and that host over 40 different plants species. Remarkable is that not a single Green Roof was ever irrigated, nor fertilized in the last 10-15 years and most of them are maintained only once a year.
No Green Roof was ever replaced or fixed and the water proofing under all Green roofs never, ever leaked (in the US 50% of the green roof are getting fixed or replaced in the first 5 years). The average installation costs were at around $4-6/sf (in the US around $12-18/sf).
All Green Roofs have three major functions: stormwater retention, stormwater retention and stormwater retention.
Green Roofs in Stuttgart are part of a building like windows or doors. There is no necessity to make a big fuss out of it.
Being the World Champion in modern Green Roof technology is nothing to celebrate – it is the responsibility of sustainable and environmental conscious lifestyle combine with common sense.
The highlight of
the tour was the Bosch Parking Garage with the world’s largest Solar
Green Roof that was designed with extremely high diversity of plants
that are found only in (local) native dry meadows.
While the Green Roof measures around ¼ Million square feet the PV is designed for 1 Megawatt.
Unmatched world record in this combination on building structure that is 100 feet above a 6 lane Highway.