San Diego green roof draws attention

05/27/2009 | San Diego News Network

Green roofs are growing in popularity as people embrace rooftop gardens and more municipalities consider mandating the practice. In San Diego, the Cottrells' house is built into a hill, and the roof is a garden. Their roof included layers of waterproofing material and was covered with materials for water retention and a root barrier, as well as several drought-tolerant plants.

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