A green roof is more than a cool architectural feature. It can help manage storm water runoff by providing a permeable surface, and it can help offset the urban heat-island effect. Rather than absorbing and storing heat like a regular roof, a green roof reflects heat and can help lower a building's cooling costs. They are also great insulators and can reduce both air and noise pollution.
On a home, the most practical type of green roof is an extensive roof, which can support a variety of small plants. Because these roofs are designed to support only a few inches of soil, they don't require much maintenance, and you'll have a new kind of eco-friendly garden to enjoy.