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DREAM HOUSE AND GREEN ROOFS it has been modified: 2012-07-14 di Enrica Garuglieri

Dream House to limit the environmental impact of the building suggests the use of green roofs and exterior walls. This will contribute to reducing the building's energy requirements and emissions of carbon dioxide.

The green roof is a roofing concept that uses lightened earth and plants, it helps to reduce the effect of thermal island, which in summer causes a temperature difference between rural areas and cities of up to 6 °.
In Germany, more than 10% of the roofs are used for greenery and in Berlin, for example, the city bears 60% of the costs associated with the roofs and the rainwater treatment plant.
The city of Tokyo requires that every building occupying more than 929 square meters of land is covered with plants for 20% of its surface.

This type of roof improves the quality of home and life, offering good sound insulation and a green oasis.

Environmental benefits:

  • Reduces the heat island effect by decreasing the temperature of the city in the summer season
  • Allow a good sunscreen roof, through the absorption of solar radiation by vegetation and soil
  • Filter pollution and reduces the carbon dioxide
  • Filter rainwater polluted
  • Results of research state that roof gardens with a thickness of cm 15 99% to absorb about the electromagnetic waves emitted by mobile repeaters
  • Filter polluted air through evapotranspiration of water vapor
  • Absorption of rainwater relieving sewerage
  • Reduces the speed of the wind

Economic advantages:

  • Energy savings on air conditioning in summer (-25%) and winter heating, given by better insulation of roofs
  • Longer life than the ordinary roofs
  • Also used for agricultural purposes
  • Durability of the waterproofing
  • Increase in property value

There are two types of green roofs: the intensive green roof or roof garden and the extensive green roof

Intensive green roof

  • Higher weight (400-750 kg / sq m)
  • Thickness of at least 30 cm
  • Garden accessible
  • Requires adequate irrigation and maintenance

Extensive green roof

  • Lower weight (60-250 kg / sq m)
  • Thickness 5-12 cm
  • Plants small size that retain the earth
  • Garden inaccessible
  • Reduced level of maintenance and irrigation system more simple

The roofs Intensive allow vegetation to accommodate root growth and air horticultural type, such as grasses, turf or shrubs.
Given the weight of the slab must be designed in function of the type of the type of vegetation cover to achieve.
Sedum plants, with over 600 species, are suitable for extensive roofs, as they are low, accumulate water in the fabrics and withstand cold winters and hot summers.
The most common are the Cape Blanc and borage white.
The technology also offers the possibility of growing in an urban setting that you can use to help feed families in urban centers, reducing the transport of vegetables from the countryside to urban centers.
In Canada and the United States, "rooftop farming" is beginning to be experimented, ie growing fruit and vegetables in greenhouses above the roofs of buildings
For example, the "Lufa farms" in Montreal has recently started selling fruit and vegetables at zero kilometer grown on the roofs
The “Lufa Farms” model provides for direct distribution to consumers through a cooperative.
While in Italy, on the occasion of Paratissima 2010, in Turin in the San Salvario district, dozens of families collaborated on an organic project carried out on an area of ​​about 40 square meters.
This is a demonstration of cohousing where all work together to grow vegetables on the roof.

This type of roofing contributes significantly to revitalize the urban ecosystem; the green roof has not only an aesthetic role, but plays important microclimatic functions with quantifiable economic consequences.

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