I have a large flat roof atop the extension to the rear of my property and it has started to bug me a little as it is a big unused waste of valuable space. I did think about putting some decking up there and railings around the outside and maybe a little conservatory so that my daughter could have a play room (it is right outside her window) and a little outside area to play in. The missus has trampled all over that idea though due to her, unwarranted IMO, safety fears. I have now started to toy with the idea of turning it into one of these green roofs, maybe grow some flowers or vegetables up there. Anyone got any experience in this area or any ideas? Know of any good companies or urls?