Extensive Green Roof Weight

Mosses sedums succulents herbs and few grasses.

Extensive green roof weight.

Semi intensive green roofs require a deeper soil layer but the payoff is in the types of plantings that can be used. An interesting example of an intensive green roof is manaton the award winning private house on dartmoor that uses local meadow grass to blend the family home into the landscape. Sedum roofs with a natural drainage layer are designed to maximize water retention while sedum roofs with a synthetic drainage layer may focus more on minimizing 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.

35 80 lbs ft. 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. 7 24 inches. For a conventional roof.

What contributes to green roof weight. There are two variations for the system build up. 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. Selected perennials sedums ornamental grasses herbs and little shrubs.

Sedum roofs are extensive green roofs that have a media depth of 3 8 inches. 15 25 lbs ft. In addition to the mosses grasses and sedum of extensive roofs semi intensive plantings include herbs flowering plants taller grasses and small shrubs. 15 to 50 per square foot.

8 to 20 per square foot. O verall depth 3 5 inches.