3. Special cases of green roofs
3.1 Pitched roofs
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Vegetated roofs are most often built on a terrace with a slope of 1 to 2%, to reduce the thickness of the drainage layer and therefore the overall weight of the structure, and to avoid water stagnation harmful to vegetation. However, sloped green roofs are also available with a maximum slope of 20%. A sloped green roof is technically more complex to install, and the specification must be carefully studied, taking all constraints into account.
To ensure the durability of a sloped green roof, a distinction must be made between areas with a slope greater than or equal to 3% (zone A), and areas with a central valley or edge (zone B or C) (figure
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Special cases of green roofs
Conclusion
Bibliography
Also in our database
Websites
ADIVET (French association for green roofs and facades)
Règles professionnelles pour la conception et la réalisation des terrasses et toitures végétalisées – 2nd edition – November 2007 http://www.adivet.net
French Waterproofing Association (CSFE) http://www.etancheite.com
...Standards and norms
- Waterproofing flat and pitched roofs with load-bearing masonry elements in lowland climates – Part 1-1: Technical specifications - NFP 84-204-1-1 (DTU 43.1) -
- Cahier des prescriptions techniques communes de mise en œuvre des étanchéités de toitures par membranes monocouches synthétiques en PVC-P non compatible avec le bitume - CSTB 3502 - 04-00
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