Clubhouse KETV, Karlsruhe

Tennis court with a green roof
project profile data


ca. 235 m²

Construction year:


Landscape Design and Installation:

Hohenschlaeger GmbH Garten- und Landschaftsbau, Muehlacker

System build-up:

“Biodiversity Green Roof” with Floradrain® FD 25-E

Project report

The waterproofing of the clubhouse of the Karlsruhe ice skating and tennis association had been tight for more than 50 years, but then the old gravel roof needed to be renewed. In search of an appropriate renovation solution for the approx. 235 m² area, the decision for a green roof was quickly made because it offered genuine added value beside a great look. Instead of a traditional extensive green roof a Biodiversity Green Roof was chosen to create the greatest possible biodiversity. In spring 2021 the installation started on a root resistant waterproofing. The first layer was the Protection Mat SSM 45. Then the drainage and water retention element Floradrain® FD 25-E was laid. It is the core of the ZinCo System Build-up. The drainage layer was covered by the Filter Sheet SF. The planning included several areas with different substrate depths ranging from 100–300 mm. The vegetation was installed by planting plug plants and sowing the ZinCo Seed Mixture “Bee Pasture“.

  • Biodiverse green roof
    The roof design turned out to be an idyll for many plant and animal species. © Hohenschlaeger/ZinCo
  • Green roof with a solar system
    A green roof is perfect to be combined with a solar system because it creates synergy effects. © Hohenschlaeger/ZinCo
  • Floradrain® FD 25-E during installation
    The drainage and water storage element Floradrain® FD 25-E was laid fully surfaced. © Hohenschlaeger/ZinCo
  • Green roof with water features
    Water bodies are important features for the water supply of birds and insects. © Hohenschlaeger/ZinCo
  • Green roof with deadwood and stony areas
    Gravel or stony areas and deadwood are major structural elements of the Biodiversity Green Roof. © Hohenschläger/ZinCo