Semi intensive green roofs as their name states are a combination of the aforementioned two types.
Extensive green roof vs intensive.
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.
Extensive green roofs.
8 to 20 per square foot.
The depth of an intensive green roof ranges from 15 cm to as much as 150 cm and can easily weigh as much 300 to more than 1500 kg m2.
An extensive green roof is characterized by a thinner layer of soil and smaller plants.
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.
Extensive roofs are thin lightweight roof systems that typically have a planting media measuring 6 to 20 cm deep while heavier thicker green roofs are known as intensive roofs and their growing media ranges in thickness from 20 cm to 100 cm.
A semi intensive green roof can give rise to a richer ecology with more diverse plant and animal species.
Semi extensive green roof.
15 to 50 per square foot.
There are two ways of planting a roof.
To bear this weight an expensive custom support structure is required.
In addition to the mosses grasses and sedum of extensive roofs semi intensive plantings include herbs flowering plants taller grasses and small shrubs.
Semi intensive roofs are generally used within highly visible area s to improve aesthetic design using small shrubs forbs and grasses.
These systems are ideal for efficient stormwater.
You can compare an intensive roof to a normal garden and this is why an intensive green roof is also known as a roof garden or garden roof.
Our semi intensive green roof systems include a richer deeper substrate and drainage solution compared to extensive roofs enabling use of a wider range of complex plant mixtures.
The green roof as a habitat.
For a conventional roof.
The distinction is based on the kind of plant involved.
A semi extensive green roof sits somewhere in between the two main options and is based on the extensive roof principles.
With more depth of growing substrate 100 200 mm it can support a greater diversity of plants but not shrubs and trees.
It also allows for a formal garden to be installed with paths grass lawn and flowers or pot plants.
Planted roofs create living space for animal species.
Semi intensive green roofs require a deeper soil layer but the payoff is in the types of plantings that can be used.
The plants that are mostly used on extensively planted roofs include grasses mosses herbs and.
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.
