It is common knowledge that a green roof can be heavy and that they need a suitable substructure. It is less well known that they also need a maintenance program that is a bit more than cleaning out the gutters every year.
The build up of organic matter in lusher climes means that it makes a fertile location for pioneer species. Now many people will tell you that the room will dry out and that this will kill off the plants, however this may not happen in areas of high build up and heavier rainfall.
So here are some images of progressive vegetation…
If you want a green roof that works you will need to plan in maintenance, whether it is a sedum room by Erisco Bauder or something more home-made.
PS THANKS http://gizfactory.com/article/going-green-with-grass-roof-tops/ FOR THE IMAGES