Article | REF: TBA1930 V2

Green roofs - Compositions and professional rules

Author: Pascale MAES

Publication date: December 10, 2015, Review date: August 28, 2023

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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