The extensive greening for the roof

The extensive green roof not only looks good. It ensures better air in cities, relieves the duct system and protects sensitive roof seals from harmful environmental influences. You can find out everything you need to know about extensive greening of your roof in our guide.

Requirements for a green roof

In order to realize an extensively green roof, your roof only needs to meet a few requirements:

  • Also read - Extensive green roofs - how is it constructed?
  • Also read - Extensive green roofs - Costs for the green eco-hood
  • Also read - The structure of the green roof
  • Functioning, undamaged roof waterproofing
  • Correspondingly stable construction: The lightest systems for green roofs only load your roof with 50 - 60 kg per square meter
  • Roof pitch from 3 ° with a corresponding construction of the green roof, from 5 ° roof pitch single-layer systems without an additional drainage layer are possible.

Layer structure of a roof for extensive greening

There are various systems for extensive green roofs on the market. Regardless of which system you choose, make sure that your green roof has an appropriate layer structure:

  • A protective film is laid directly on the roof. It is root-proof and prevents the plants from damaging the roof waterproofing.
  • A storage mat, also known as a roofing fleece, is laid on the protective film.
  • A drainage layer can then be laid; this layer is not always necessary.
  • A filter layer ensures that no dirt penetrates the system and that the water drainage is guaranteed.
  • The roof substrate is applied to the filter layer.
  • Planting takes place on the roof of the roof.

When laying all layers, make sure that the roof drain is cut free. Only after the roof soil has been applied are the various fleeces and mats "hidden" or "hidden" under the roof edges. finally attached.

Suitable plants for extensive greening

Use mosses, grasses, herbs and succulents for extensive greening. Well-thought-out plant mixtures adjusted to the special growth conditions on the roof are available in stores. Species-rich roofs should contain around 12 different types of plants.

Perennial grasses such as diamond grass, golden ear grass, feather grass, blue-ray oats or ciliated pearl grass are important for the structure formation on the green roof.

Various flowering plants bring color to the roof and take care of bees and insects. These include the bulbous buttercup, the common goldenrod, bluebells, various types of lilies and carnations.

Succulents, especially the Sedum species, serve as food for other insects and caterpillars. The great sedum (Sedum maximum) and the purple sedum (Sedum telephium) thrive on extensively green roofs.

Care of the green roof

In the first few weeks after planting, you should water the extensively green roof thoroughly 2 - 3 times a week. After only 1 - 2 years a small, viable ecosystem has formed, for which you only have to carry out minimal maintenance and which can withstand longer dry periods.