Extensive Green Roof And Intensive Green Roof

What is a green roof.

Extensive green roof and intensive green roof.

A green roof is a layer of vegetation planted over a waterproofing system that is installed on top of a flat or slightly sloped roof. 15 to 50 per square foot. Extensive green roof an extensive green roof system is characterized of its vegetation ranging from sedums to small grasses herbs and flowering herbaceous plants which need little maintenance and no permanent irrigation system the growing medium depth for an extensive green roof system is typically 6 inches or less. Semi intensive green roofs require a deeper soil layer but the payoff is in the types of plantings that can be used.

In addition to the mosses grasses and sedum of extensive roofs semi intensive plantings include herbs flowering plants taller grasses and small shrubs. Extensive green roofs. 8 to 20 per square foot. These systems are ideal for efficient stormwater.

Green roofs are also known as vegetative or eco roofs. They fall into three main categories extensive intensive and semi intensive. A properly designed and installed extensive green roof system can cost 108 248 m 2 10 23 sq ft while an intensive green roof costs 355 2 368 m 2 33 220 sq ft however since most of the materials used to build the green roof can be salvaged it is estimated that the cost of replacing a green roof is generally one third of the initial installation costs. It also allows for a formal garden to be installed with paths grass lawn and flowers or pot plants.

A semi intensive green roof can give rise to a richer ecology with more diverse plant and animal species. Typically these roofs will have more soil and some small shrubs as well as the low growing wildflowers and sedums found on an extensive roof.