On the other hand, the development of these technologies has been led so far by the manufacturing industry of conventional roof systems, which see in the green roofs a new business niche. However, the systems and components of industry follow the logic of a traditional roof, and not necessarily the one that supports a contained ecosystem.
The key to finding local answers to these sophisticated materials is precisely understand what they are for and how they work.
A green roof consists of several critical parts: (the photos were taken by me at a workshop on green roofs that I organized here in our Vancouver offices - questions are welcome)
growth medium , where a thorough knowledge in horticulture is critical to the success of a healthy green roof. The association with orchards that are interested in growing specifically for these decks is an usually good strategic partnership.
Filtering and irrigation fabric . This is a rather simple layer in its concept and manufacture: it seeks to avoid the transfer of soil from the growth medium to lower layers, keeping the system clean. It also has the capacity to absorb water ensuring minimum levels of humidity. Some systems like Hydrotech in the photo, incorporate to this level, a mechanism of irrigation of high efficiency.More news: Lost in the paradise | Tumblr
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Root inhibitory layer . Although the possibility that a plant growing in 10 cms of soil can develop aggressive roots is rather remote, always incorporates a last layer of protection, or rather separation between the green roof system, and the rest of the structure of the building.
Below are typical roof layers, such as water and moisture barriers, rigid insulation, structure, etc.
Returning to the drainage layer in course to the interior of D +) it is important to understand its properties: retention and evacuation of water. Talking with my expert advisor and partner on this subject, we conclude that the aforementioned layer can be easily replaced by volcanic granulated material. This has the capacity to retain some water and a large drainage capacity. In countries like Chile, it is a local material and in full disposal. In any case, I want to rescue the idea of finding local solutions as a basis for an efficient and truly sustainable construction.
More photos here