![](http://www.alamy.com/thumbs/6/5D4F4BFA-E0CF-49C9-904E-1A599D235F3A/2K0333H.jpg)
Mülheim an der Ruhr, North Rhine-Westphalia, Germany, flat roof is prepared for green roof. Here, the substrate layer is applied to the separating fleece to the drainage layer below.
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Photo credit: © Rupert Oberhäuser / Alamy / Afripics
License: Licensed
Model Released: No
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