If you have ever wondered how much it would cost to install a green roof on a Brooklyn brownstone, how long it would last, how much you would save in heating and cooling, the payback and all sorts of other information then you can go to this green roof cost/benefit calculator. It is called the GreenSave Life-Cycle Cost Benefit Calculator.
Compare the cost of green (vegetative) roofing with conventional roofing systems!
As my green builder colleague David Bergman pointed out, though, “It’s created by Green Roofs for Healthy Cities (which might not be objective) and the Athena Institute (which is more likely to be objective) with funding by Tremco (who probably have a vested interest).”
Like all things in life it might not be black and white.