There are a number of environmental benefits of a living roof, with the moss and other plants being home to a variety of insects, creating its very own eco-system on a miniature scale. If the correct plants are chosen, you will not need to water the roof once it is properly established However, when wet, the roof can become heavy and so it is sensible to make sure that it can comfortably support this additional weight, without collapsing or being damaged.
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