Green roof typology
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Extensive green roof
An extensive green roof is ideal in case of an impassable roof. Plant species selected for this type of roof do not require any further treatment or maintenance after implementation. Though these are slow-growing plant species, they have a significant impact on biodiversity. The thickness of the extensive roof type layers is about 20cm, while their weight is usually between 50-150 kg/m2.
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Intensive green roof
The intensive green roof is a landscape oasis, rooftop garden or urban garden that needs to be maintained regularly. Depending on the thickness of the layers, ranging from 30 to 100cm, intensive green roofs imply the implementation of both low, and medium and high plant species. Their weight varies from 150kg to 2000 kg/m2.
The blue-green roof combines blue and green roofing technologies, which can increase the overall benefits of greening the roofs. The goal is to increase the amount of stored water, and control the amount of discharged water. In recent years, these types of roofs have become "smart", using sensors and software that can control how water is stored and discharged.
Bio solar roof
A bio solar roof is an extensive roof combined with photovoltaic solar panels (PVs). The green roof liner is used as the ballast needed to support the frames to which the PVs are attached, benefiting both the green roof and the photovoltaic composition.
Biodiverse green roofs are designed to increase the biodiversity of a local area, and to provide habitat for certain bird species, bees, and beneficial insects. It combines different layers of substrate, various types of plants, shrubs, as well as sand, gravel or bird feeders.
For the city and citizens
Reduces the Urban Heat Island effect
Vegetation mitigates the effect of urban heat island through three processes: Plants provide shade for objects, physically protecting them from the sun's radiation. Second, during the process of photosynthesis, vegetation converts water, carbon dioxide, and solar radiation into glucose and oxygen. With the help of evapotranspiration process, they keep the temperature low by releasing water from the roots through the leaves in the form of vapor. Third, vegetation provides a shield against wind gusts.
Rainwater drain off
Green roofs retain atmospheric water and allow evaporation in the urban environment, thus cooling the environment.
Reduce water runoff
A green roof reduces runoff during heavy showers by 50-100%, and delays rainwater runoff into the sewer system.
The substrate and the vegetation absorb dust particles and air pollutants, thus creating a better microclimate.
Increasing the number of plant species, attracting birds, and beneficial insects is one of the largely increasing benefits of green roofs, making these oases especially valuable.
For building and its users
The green roof provides thermal protection: in summer it acts as a heat shield, and in winter as additional thermal insulation. Depending on the thickness of the substrate, it reduces heating costs by up to 20%.
Increase the lifespan
Protects the roof from UV rays. Research has proven that green roofs double the life expectancy of a roof.
They absorb sound, therefore reducing noise. Depending on the thickness and type of roofing, green roofs decrease interior noise of buildings up to 40 db.
Protects the roof waterproofing
From extreme temperature fluctuations, UV radiation, and other atmospheric influences.
Intensive green roofs are suitable for growing fruits and vegetables. The thickness of the layer allows cultivating these plant types as well, while wind and orientation are other equally important factors to be considered.