Get vegetative roof installation right, to avoid costly repairs later
March 16, 2011
http://www.stltoday.com/business/local/article_31fb5daa-521a-5222-9f3c-b... A crucial factor before installation is ensuring that the roof can support the weight of soil, plants, and the water that they retain. Vegetative roofs use engineered light-weight soil. The weight on the roof depends on the depth of the soil, the types of plants, and the volume of water it holds. When saturated with water, a green roof can add as much as 36 pounds per square foot to the roof’s overall weight, O’Donnell says. “The American Society for Testing and Materials has standards for dead loads on green roofs, which in some cases require a reinforced concrete deck,” he adds.