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How an intensive green roof is made and what are the strategies to make it lighter and thinner. All the info on the stratigraphy of an intensive green roof set up on a flat surface.
Unlike the extensive green roofs, those of the intensive type, can only be installed on easily accessible roofs with a flat surface. All the differences of weight is thickness between intensive green roof and extensive are contained in the article dedicated to the comparison between the two covers:Extensive and intensive green roof.
Instratigraphy of an intensive green roof there is no thermal insulation layer, the thickness of the various layers provided in the preparation of a intensive green roof, gives the structure a high thermal inertia. As well as the thermal insulation layer, the intensive green roof stratigraphy it also lacks the vapor barrier, foreseen in extensive green roof.
By comparing the stratigraphy of an intensive green roof with thestratigraphyof an extensive green roof, we will only have differences in thickness and therefore in weight. For your deductions I invite you to compare thestratigraphywhich follows with the in-depth study dedicated tostratigraphy of an extensive green roof.
Intensive green roof, stratigraphy
- 1) Attic
It consists of a roof slab (brick type).
- 2) Primer
It has a bituminous primer that covers the entire surface of the roof. The primer penetrates the porosity of the cement surfaces and promotes the adhesion of the next layer.
- 3) Waterproof membrane and anti-root membrane
Just as seen in the stratigraphy of the extensive green roof, also in this case the membranes prevent the penetration of roots into the underlying bituminous layer and into the floor.
- 4) Draining layer
This layer is used to better dispose of rainwater, avoiding harmful restraints for the ceiling and plants. Generally the draining layer is given by an impermeable mantle of expanded clay granules. The thickness is 10 - 15 cm if you intend to cultivate the lawn on the roof while it reaches 30 cm for those who want to plant trees.
- 5) Filter layer
It is given by a polyethylene membrane that is placed immediately after the soil layer. It has the function of confining the roots in the soil layer and retaining the earth. This layer is permeable only to water which will be managed by the underlying drainage layer.
- 6) Substrate of cultivation and vegetation
It is in the growing medium that the roots of the plants develop. The thickness of this layer depends on the type of vegetation to be cultivated. The weight and thickness of aintensive green roofit mainly depends on the choice of botanical varieties provided. This layer will have a thickness:
- Between 20 - 30 cm for a green roof with climbing plants and shrubs up to 60 cm high.
- Up to 40 cm for a green roof with flowers, rose gardens and shrubs.
- Up to 60 - 100 cm for green roof with saplings.
It is clear that a light intensive green roof can only be achieved with lawn and small shrubs. In the case of the planting of trees with a high trunk, a basin of sufficient size and height must be provided, it will be inside this tank that the root system of the tree will develop.
In the design of aintensive green roofand in choosing the thickness of its last layer, the arrangement of the plants and their growth over time must be taken into account. During the planting, minimum distances must be respected both between the plant components and between all the vertical parts of thegreen roofand drains.
Light intensive green roof
Therestratigraphyof alight intensive green roofit does not change, but the thickness changes. Typically, a light intensive green roof it is characterized by a maximum thickness of 24 - 30 cm and a total weight, which is estimated at maximum water saturation, of about 215 kg per square meter. Alight intensive green roofis designed to create a walkable lawn finish on the roof.
Photo: in the photo above, the stratigraphy of a Daku intensive green roof. The Daku Intensive Green Roof stratigraphy shown in the photo sees the following legend:
- Sloping floor
- Root-proof waterproof covering
- Daku FSD 20 (62 mm)
- Daku Stabilfilter SFI filter (1.45 mm)
- Daku roof soil 1 (150 mm)
- Daku roof soil seeding (30 mm min.)
- Sprinkler irrigation system
The values indicated in brackets describe the minimum thickness.
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