In the case of green roofs, it is essential that the waterproofing itself is either root-resistant or root-resistant by applying an additional root protection layer.
Root-resistant waterproofing materials are those that have been successfully tested in accordance with the "Method for Investigating the Root Strength of Membranes and Coatings for Green Roofs" developed by the Research Society for Landscape Development Landscaping (FLL ).
Especially in the case of connections and terminations, penetrations and joints, it is important to ensure that they are root-proof. When determining the approach and end heights, the height of the greening structure must also be taken into account. The roof waterproofing or the additionally applied root protection layer must be protected from mechanical effects with appropriate protective layers before the greening structure is applied. (e.g. with rot-resistant fibre mats of appropriate strength)
In general, the Flat Roof Directive or DIN 18195-5 Building waterproofing (waterproofing against non-pressurised water) always apply to used roof surfaces with intensive greening.
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