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 concept of coverage that uses the earth lightened and plants, it helps to reduce the effect of heat island, which in the summer determines a temperature difference between rural areas and cities up to 6 °.
In Germany more than 10% of the roofs is destined to green and Berlin for example the city undertakes to pay the 60% of expenses related to roofs and to the treatment of rainwater.
The city of Tokyo requires that every building that takes up more than 929 square meters of land is covered with plants for 20% of its surface.
This type of roof improves the quality of housing and life, offering good sound insulation and a green oasis.
- 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
- 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: intensive green roof or roof garden and 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.
The roofs are suitable for extensive sedum plants, with over 600 species, since they are low, water accumulates in the tissues 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 will begin to experience the "rooftop farming" or grow fruit and vegetables in greenhouses on the roofs of buildings
For example the "Lufa farms" in Montreal has just started selling fruits and vegetables at Kilometer Zero cultivated rooftops
The model "Lufa Farms" predict the distribution direct to consumers through a cooperative.
While in Italy, on the occasion of Paratissima 2010, in Turin in the San Salvario dozens of families have collaborated on a project carried out over an area of about bio 40 sqm.
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; green roof not only has an aesthetic role, but performs important functions microclimate with quantifiable economic benefits.
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