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5. Greening complex
The composition of a vegetation complex depends on several parameters: location, slope, load-bearing capacity of the supporting element, aesthetic requirements, level of maintenance accepted by the client... The various components are applied directly to the waterproofing. In the case of an inverted roof, the green roofing complex is laid on top of the thermal insulation, possibly with an interposing layer.
5.1 Drainage layer
The drainage layer evacuates excess water and prevents root asphyxiation. It is optional for slopes greater than 5%, or even 3% in some cases. Drainage materials must have a permeability of at least 0.3 cm/s (180 mm/m), be frost-resistant and structurally stable (figure
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Greening complex
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Reference texts
DTU 43.1 (NF P 84-204) – Waterproofing work on flat roofs with load-bearing masonry elements
DTU 43.3 (NF P 84-206) – Installation of ribbed steel sheet roofs with waterproof coating
DTU 43.4 (NF P 84-207) – Roofs made of load-bearing wood and wood-based panels with waterproofing.
DTU 20.12 (NF P 10-203) – Masonry structural work for waterproofed...
Organizations and reference sites
ADIVET (Association française des toitures et façades végétales) brings together the key players in the green roofing industry: component and system manufacturers, building and landscape contractors, trade associations, project managers and owners, training and research organizations, design offices... http://www.adivet.net
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