University puts 'green roof' to many uses

ST. LOUIS (AP) -- Washington University in St. Louis has developed a "green roof" for a building known as the South 40 House, and that roof is being put to plenty of uses.

The 10,000-plus-square-foot roof connects with the lawn to create a grassy area featuring paths and benches. It contains grass, native plants and 110,000 pounds of soil. The roof was installed last week.

The university says the roof helps the environment, in part by reducing water runoff. About 90 percent of the rain that falls on it is absorbed by the soil and vegetation.

The roof also improves insulation for the building. It even allows for growing herbs that can be used for cooking.