How deep is an extensive green roof?
How deep is an extensive green roof?
4 to 6 inches
Typically, the system depth for an extensive Green Roofs rages from 4 to 6 inches (10 cm to 15 cm). Although there are shallower extensive Green Roof systems on the market, they are only resilient in specific climate zones.
How deep does a green roof need to be?
Now comes the growing medium, which for a sedum roof should be at least 8cm (3in) deep and for a roof of wildflowers, herbs, salad and strawberries at least 15cm (6in) deep.
What are intensive and extensive green roof sizes?
Typically, an extensive green roof has less than 200 mm of soil or substrate, whereas an intensive green roof can have areas of substrate that are a metre or more in depth.
What is the maximum pitch for a green roof?
Green roofs are suitable for any pitch of roof. However, when dealing with a sloped green roof with a pitch of more than 9.5°, you’ll need a design solution for retaining water and ensuring the substrate stays in place. There is no steepest pitch for a green roof – they can even grow vertically.
What is a extensive green roof?
Although there are no precise definitions of them, an extensive green roof has a shallow growing medium—usually less than six inches—with a modest roof load, limited plant diversity, minimal watering requirements, and is often not accessible.
What is extensive roof?
Extensive landscaped roofs are an ecological alternative to conventional surface protection or ballast layers such as gravel and pavers. They are lightweight and have a shallow build-up height. Suitable plants include various Sedum species, herbs and some grasses.
What is an extensive green roof?
What are the 3 types of green roofs?
Three types of green roofs exist: extensive, semi-intensive, and intensive 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.
How steep can a living roof be?
Most vegetation will grow on quite sever slopes, but the designer must consider the practicalities of installing the green roof and just as importantly how the roof is to be maintained. Slopes above 25 degrees are normally considered too steep to walk on and require additional design features.
What are the 5 parts of a green roof?
These components make up the functional layers of both intensive and extensive green roofs. Common components include decking, waterproofing, insulation, filtration and drainage, planting medium, and plant material.
How do intensive and extensive green roofs differ?
An extensive green roof requires minimal maintenance. It is enough to fertilize twice a year. On the other hand, an intensive green roof requires regular maintenance such as pruning to keep the plants in good condition, just as you would in an ordinary garden.
What is a semi intensive green roof?
Description: The Semi‐Intensive Green Roof System has a thicker media depth, which gives designers the flexibility to add grasses and perennials in addition to sedum on their vegetative roofs. Columbia Green Semi‐ intensive growing media, engineered to support a wider variety of plant materials is used in this system.