Intensive green roofs commonly thought of as garden roofs are the more complex of the two exhibiting much greater plant diversity and a greater need for design expertise says peck.
Intensive roof garden structure.
Unlike conventional earth covered structures garden roof assemblies are lightweight and can be installed on a wide variety of new and existing structures.
In case of garden or landscape type the substrate thickness used ensures optimal conditions for the vegetation used but of course the climate and microclimate are also very important.
A tree can then be placed on a mound or in a container.
As a roof type that requires frequent maintenance intensive systems can be thought of as gardens on a roof.
Utilizing the modern roof area by being a pleasant environment to regularly visit or live in an intensive green roof system assures a better quality of life.
Green roofs tend to improve the life of the membrane because it is completely covered by plantings and isn t exposed to the sun s harsh uv rays.
The basic anatomy of a green roof consists of vegetation growing medium filter membrane drainage layer waterproof root repellant layer roofing membrane support for plantings above thermal insulation vapor control layer and structural roof support.
In these cases there is a difference in height with regard to the structure of the roof garden.
This deeper soil allows intensive roofs to accommodate large plants and dramatic plant groupings.
This is especially true of intensive green roofs which can have soil that is two feet deep or more.
1 extensive vegetative roofs which are 6 inches or shallower and are frequently designed to satisfy specific engineering and performance goals and 2 intensive vegetative roofs which may become quite deep and merge into more familiar on structure plaza landscapes with promenades lawn large perennial plants and trees.
Planting media for intensive green roofs are a foot deep at minimum and have saturated weights ranging from 80 to 120 pounds per square foot depending on type and depth of planting medium and the type of plants.
These green roof systems lie between the extensive and the intensive and usually include a mix of plant types.
For this kind of rooftop gardens perennials or annuals shrubs especially native species are recommended.
A new habitat intensive green roofs provide an opportunity for a new habitat of plants and animals to be incorporated into an urban structure.
The structural engineer must factor in the weight of completely saturated soil since the plantings and the soil will hold a significant amount of water.
Replacing the impervious surface of a conventional roof with a vegetated can help to substantially reduce storm water run off and restore the balance with nature in our urban centers.
This system requires some maintenance from time to time.
Walter van de werken.
It is also important to factor in the type and lifetime of the roof membrane that will be used.
Sedum matting only requires a few centimetres of substrate while you need at least 70 80 cm root space for trees.
In contrast with an extensive green roof there are almost unlimited possibilities with respect to the plants that can be used in an intensive system.
The intensive green roof s vegetation is similar to a garden at ground level because the structure allows this.
