The Union of Concerned Scientists posted an interesting "greentip" today on "green" roofs. The rage these days, and the first of two options they presented, was literally going green on your roof -- covering it with soil and growing grass, flowers, shrubs (perhaps even vegetables!). Benefits can include lower energy costs, providing shelter for wildlife (I couldn't help but think of the rats that got into our attic not too long ago...), and (counterintuitive to me) a longer lasting roof (because you shelter it from the elements). Of course, you'd need a strong, well supported roof to do that. I have a feeling most conventionally built roofs wouldn't last a day under that kind of weight. I looked up in our own attic at the trestle roof we've got.... hardly any support at all. UCS's estimated costs for a green roof: $10-$25 per square foot including installation. Check out Green Roofs for Healthy Cities' website for more and some cool photos of what your roof could look like.
