This green space could be below at or above grade but in all cases it exists separate from the ground.
Green roof from above.
A green roof is a roof that is partially or completely covered with vegetation and soil planted over waterproofing membrane.
Green roof development involves the creation of contained green space on top of a human made structure.
For intensive green roof profiles a drain restrictor may be used to retain water in the base of the profile for subsequent plant transpiration.
A green roof moderates the heat flowing through the roof.
A green roof or rooftop garden is a vegetative layer grown on a rooftop.
Green roofs can provide a wide range of public and private benefits and have been successfully installed in countries around the world.
Especially if it is designed specifically for biodiversity.
An extensive green roof is a thin usually less than six inches lightweight system that is typically predominantly planted with succulents drought tolerant ground covering plants and grass.
In truth this should be the future as this approach provides the greatest range of benefits.
Types of green roofs.
The additional thickness of the growing medium provides extra thermal insulation.
Some parts of germany require green roofs on all new buildings.
Using green roofs in cities or other built environments with limited vegetation can moderate the heat island effect particularly during the day.
Green roofs provide shade remove heat from the air and reduce temperatures of the roof surface and surrounding air.
Due to the excessive water amounts associated with green roofs the membrane must be strong enough to support this water weight and to not let it seep through.
This helps to reduce temperature fluctuations caused by solar radiation.
An intensive green roof is a deeper typically greater than six inches heavier system designed to sustain complex landscapes.
Greening a roof is not simple or cheap.
Over a black roof flat.