5/27/2007

May 25th - City Hall Chicago - INCREDIBLE!

It's difficult to begin with a roof like this one...! It's just amazing to see how it was possible to design a green roof like that on an antique building as City Hall.
I spent the morning with Kevin Carroll. Like the green roof, this guy is incredible! I have never seen someone so good in botanic. Especially native plants of Illinois. I learned a lot of different plants' names. There are probably more than 100 different species on the roof.

Nice roof! Thank you Kevin...

Every year they try native species (planted by plugs by a local nursery). This roof is like an experimental field. I think that all the green roofers HAVE to go there before building a green roof. It's the perfect example of what we want on all the roofs (if the building is engineered for that...).
Describing this roof will take me a book, so I have decided to put in more photos because sometimes pictures speak more than text (especially my 'french-english).
I just want to say that the idea of using Polystyrene to build some kind of relief is just smart and really aesthetic. It gives to the roof an natural style. Especially with all those native plants. Some plants were in bloom, such as the Columbine, the Pusatilla Posque Flower, the Amorpha Canescens, the Baptista Australis, etc..

About the maintenance, you have to know that it's very very high. I mean, one worker (who knows the plants well), is on the roof from April to October. His main task is hand-weeding and planting some new plants (annuals a bit in early June and new natives).
More surprising, a beekeeper was there when I visited the roof. He told me that Bees love the roof and the honey is very good there (because of the natives..)

The Beekeeper (top right), Kevin and SanDiego the worker (first plan).

Unfortunately, it's difficult for the public to access that roof because of security reasons (it was forbidden to build a guardrail because of the building's historical interest). But the roof is visible from plenty of surrounding windows and sometimes people visit it.

A impressive Dragonfly, there were to many!

To conclude, I really appreciate to answer your questions, if someone reads this comment, because I have much things to tell about this piece of green ART!

19 comments:

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Hi Guillaume, Thank you for posting your photos of green roofs. I am a garden designer in Los Angeles and have a project for a hotel that involves planting a garden on the roof. It is very hot and dry in the summer/ wet and cool in the winter. I would love to have information on the types of soil media that have been successful in similar climates.
Your answer will be much appreciated!

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Francie said...

Hey Guillaume, After viewing the City Hall roof top garden, which native plants seemed to be growing the best and how deep was the soil up there?