Today a group of students working on the Green Panels and myself visited Groendak.nl in Scherpenzeel. We received a lot of detailed information about the materials applied in different types of green roofs, which can be used for developing our prototypes and for considerations of the entire life cycle.
Flat roof, from top to bottom:
- Local vegetation - Heath, Dune grass, Peat grass. Sedum also possible.
- Soil - Potting soil (Netherlands)
- Substrate - Lava rocks, aerated by holes so water can pass through and nutrition is caught (Germany, Eiffel area)
- Filtration layer - Filtration fleece, water can pass but particles are caught (Belgium)
- Drainage layer - plastic, water can go underneath or stored inside meaning plants are irrigated for 6 to 8 weeks (Germany)
- Protective layer - Fleece (Belgium)
- Roof
- The net for edges to prevent wind blowing the layers off the roof is made from recycled plastic (Netherlands)
These materials work well in all climates. The plant species will not perform well in all climates. We also received information for sloped roofs and green tiles, and performance measurements, which I will save for a later post.
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