Cultivated moss as a green roofing method?

The house next to me had a rounded roof on which they had moss growing.  I thought it looked great; however, after a couple of years they removed it all.  Apparently, it drew the mosquitoes, gnats, and other bugs making it impossible for them to sit out in their yard and enjoy it. I don't know if you would have that problem as I don't know what area you are in, but it's worth thinking about.  I hope you can do this without the bug problem as it's really a nice effect.

The previous answer by UR193 brought up some excellent points. If you want to hear from a company that installs roof made of moss, you can contact this company and see what they have to say, keeping in mind the pros and cons. I would be interested in hearing what you decide to do.

Moss will not be "green roofing". First, it needs a relatively cool, mostly constant moist site , plus some organic material on which to grow and your roof cannot provide that environment unless you go to a whole lot of trouble and expense. Second, even if you could get it to grow, it would form only a very thin layer that it would have no insulating effect, especially when it dried out, which would be most of the time.