Extensive green roofs are lightweight with a shallow layer of growing substrate of less than 200 mm deep requiring minimal maintenance.
Extensive green roof layers.
By alan burchell rubyana lyon green roof mar 3 2017.
Green roofs are also known as vegetative or eco roofs.
They generally have lower water requirements and use small low growing plant species particularly succulents.
The soil is usually not more than 5 deep and is sometimes contained by a tray system which provides a barrier to excessive growth protects the roof membrane and also interlocks the.
Green roofs have traditionally been categorised as extensive or intensive.
Extensive green roofs are designed to be low maintenance lightweight systems with no general access.
To make this process work various green roof layers are created to give it the most effective and solid chance of being.
They fall into three main categories extensive intensive and semi intensive.
Each green roof is unique as their designs and performance vary by region climate and building type and use.
Extensive semi intensive and intensive green roofs.
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.
Extensive green roofs are generally made up of a very thin layer of soil or other planting medium with shallow root plants like sedum mosses and grasses.
The vegetation for this roof needs a lot of water and regular maintenance.
Typically they have thin layers of substrate the growing medium to keep depth and weight to a minimum.
Extensive green roofs sedum roof systems.
However the difference between green roofs and an actual green roof is that a green roof comes with various layers.
Three types of green roofs exist.
Simpler shallower cheaper green roofs with limited variety of plants are called extensive green roofs these systems are easy to install require little to no maintenance or irrigation and weigh the.
We have chosen to use the word vegetative rather than the word green in this guide because a non vegetative roof could be considered to be environmentally green without being vegetative.
Examples of extensive green roofs.
In short a green roof is made to purposely grow grass.
The vegetation consists of lawns shrubs and trees and can easily be combined with pedestrian and vehicular pavements.
Intensive green roofs are comparable to soil bound green areas such as gardens and park landscapes.
Comparison of the various green roofs an extensive green roof is characterised by its low weight a thin layer of growing medium green substrate a mix of plants adapted to conditions on the roof minimum maintenance and low installation costs.
Vegetative roofs also known as green roofs are thin layers of living vegetation installed on top of conventional flat or sloping roofs.
