Extensive Green Roof Weight

25 40 lbs ft.

Extensive green roof weight.

35 80 lbs ft. Selected perennials sedums ornamental grasses herbs and little shrubs. Sedum roofs are extensive green roofs that have a media depth of 3 8 inches. 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.

What contributes to green roof weight. For a conventional roof. 7 24 inches. 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.

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. Mosses sedums succulents herbs and few grasses. 15 to 50 per square foot. O verall depth 3 5 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. 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. 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.

Semi intensive green roofs require a deeper soil layer but the payoff is in the types of plantings that can be used. 8 to 20 per square foot.