2. Three types of green roofs
There are three coexisting processes for designing and building a green roof:
The roof-garden or intensive vegetation requires a minimum of 30 cm of soil, which allows traditional vegetation to be planted;
the vegetation layer, usually based on sedums (low-growing creeping perennials) or extensive vegetation that can make do with less than 10 cm of substrate;
an intermediate or semi-intensive vegetation system with a substrate thickness of between 10 and 30 cm, allowing greater plant diversity (figure 1 ).
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Three types of green roofs
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