Biodiverse Green Roofs

  • Green roof with meadow flowers, herbs and Sedum
  • Extensive green roof with gravel and water course
  • Extensive green roof with dead wood and stones

Biodiverse Green Roofs – Providing Substitute Habitats for Flora and Fauna

In areas where nature has been destroyed by construction works and the ground is sealed, green roofs can partially compensate for lost green areas and can provide replacement habitats for flora and fauna. Above all, natural, low-maintenance extensive green roofs are important refuges for flora and fauna. Wild bees, butterflies and ground beetles find food and shelter there. However, the development of biodiversity depends to a great extent on how the habitats that are provided for the flora and fauna on a roof are structured. Pure sedum green roofs that are frequently installed in conjunction with very shallow substrate depths are not suitable for exploiting this potential. Indeed, the biotope function of greened roof areas can be specifically fostered with very little work using various design features and applying basic biodiversity principles during the planning and implementation stages.

How to foster the biotope function of greened roof areas:

Vegetation Modulating the substrate surface: Varying the substrate depth creates different habitats that will extend the range of species available in the planting areas.

Sand and gravel bed Sand pockets and coarse gravel beds: Plant-free areas are an important enrichment of the biotope and are used by insects and other roof inhabitants as a hideaway, breeding ground and a sun trap.


Temporary water body Temporary water bodies: Using borders and sheeting, areas can be created to retain stormwater on the roof for an extended period of time. It improves the amount of water available, e.g. for insects and birds.


Bumblebee on Sedum Plant selection, e.g. forage plants: If areas with a deeper substrate are available (e.g. by creating hilly mounds), forage plants can be used for insects and birds or even a wider range of indigenous plants.


Nesting aid Nesting aids: The use of nesting aids specifically fosters insect colonisation.


Ladybug on dead wood Introducing deadwood: Dead branches and tree trunks are a particularly valuable structural element. Deadwood is used as a habitat by moss, lichens, fungi, beetles, flies, midges, ants and wild bees, among others.

System build-up



Grafik des Systemaufbaus
Plant level and biotop bounderies
System Substrate
Filter Sheet SF
Floradrain® FD 25-E
Protection Mat SSM 45
Root Barrier WSF 40, if waterproofing is not root resistant.

Product Details

Filter Sheet SF

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Geotextile of thermally strengthened polypropylene, applicable as filter sheet above drainage elements for normal mechanical stress.

Floradrain® FD 25-E

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Pressure resistant drainage and water storage element of recycled polyolefin for use on extensive green roofs.

Protection Mat SSM 45

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Water and nutrient storage mat of synthetic fibres, for the application as a protection layer under green roofs, gravel fills, slab pavings, etc.

Root Barrier WSF 40

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Established, proven and tested sheet, easy to install, made of environmentally friendly polyethylene for the use as root protection under extensive green roofs.

No product information available


The system solution shown relates to the green roof build-up in particular. The roof construction itself is only shown schematically and must be planned and executed according to specialist rules for waterproofed roofs.

  • Bumblebee on thyme
  • Bee on Sedum
  • White butterfly on lavender
  • Insect on Yellow Chamomile
  • Greater Knapweed
  • Bee on Echium vulgare
  • Bumblebee on a Scabiosa flower
  • Bumblebee on Origanum