GREEN

Green Roofs: Practical Questions With Malcolm Gladwell

11/29/2008 05:12 am ET | Updated May 25, 2011

MG: How do you install it?

AN: Well, first you want to make sure your roof is waterproof. So you don't want to just put a green roof on top of shingles, for example. You want a single-ply waterproof membrane. You have a drainage layer, a filter fabric, growing medium (soil) and plants. The growing medium can be anywhere from 2 to 16 inches depending on what type of green roof you have.

MG: Lets walk through the benefits. As a homeowner, why would I want to do this with my roof?

AN: You are going to save money in heating and cooling costs, because the green roof acts as an insulation layer. It is also going to look beautiful and more and more cities are offering financial incentives to building owners who install green roofs.

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