Extensive Green Roof Weight

There are two variations for the system build up.

Extensive green roof weight.

For example a traditional intensive green roof system for plants and grass featuring at least six layers including soil filter fleece drainage layer and vegetation is. Semi intensive green roofs require a deeper soil layer but the payoff is in the types of plantings that can be used. The two key elements that contribute to weight are the density of the different layers that make up the green roof and how heavy it becomes as a result of rain absorption. In addition to the mosses grasses and sedum of extensive roofs semi intensive plantings include herbs flowering plants taller grasses and small shrubs.

8 to 20 per square foot. What contributes to green roof weight. 35 80 lbs ft. Intensive green roofs.

25 40 lbs ft. Sedum roofs are extensive green roofs that have a media depth of 3 8 inches. Intensive green roofs are essentially roof gardens and may also need to allow for the additional weight of paving and terracing furniture and even trees. O verall depth 3 5 inches.

7 24 inches. A 2006 study by the university of michigan comparing costs of conventional and green roofs showed that on average installing a green roof costs about 22 00 sq. For a conventional roof. 15 25 lbs ft.

Selected perennials sedums ornamental grasses herbs and little shrubs. 15 to 50 per square foot.