Outdoor planting


Expanded clay for landscaped roofs

Both for new projects and for the renovation of existing planted areas, the best results are achieved when Liadrain is incorporated into the mix. This is due to the improvement of the soil structure, the aeration of the roots and the regulation of the water balance. Liadrain is a crushed expanded clay product for professional roof planting and landscaping projects. In single-layer structures, Liadrain can be used as a vegetation and drainage layer, whereas in multilayer constructions, it forms a drainage layer which also contributes to water retention. Liadrain® has been tested by the research company Landschaftsentwicklung Landschaftsbau e.V. (FLL) and complies with its guidelines for mineral fills for drainage courses and vegetation substrates for single-layer extensive landscaping.

A pure mineral substrate

As a purely mineral, open-pored product, Liadrain is able to store a large volume of water – more than 76 % of its dry weight. Even when the material is saturated, the balanced distribution of granule sizes ensures an outstanding soil-air content at all times. Chemically neutral, frost-resistant and non-flammable – the Liapor substrate is also completely free of germinable weed seeds and regenerative plant material and is resistant to hydrolysis, soil solutions and microorganisms.

An outstanding mix

Organic and mineral mixtures which tend to become compacted can be permanently aerated through the addition of Liadrain as a substrate material - in particular when growing tree species and shrubs in containers. Thanks to its action, Liadrain permanently improves the physical and chemical properties of the substrate. When delivered, the crushed expanded clay contains no nutrients. Users are recommended to employ coated controlled-release fertilizers to feed their plants. In the case of plants whose roots require humus, an organic substance in the form of quality-controlled compost or bark humus can be added.

Loose, bagged or silo delivery

Liadrain® can be delivered as a loose fill as well as in "Big Bags" or foil sacks. When Liadrain® is delivered by silo wagon and blown onto the roof via flexible hose, it is possible to achieve considerable time and cost savings compared to bag or sack delivery – even when handling smaller volumes. Liadrain is available in the grain sizes S (2–6 mm) and L (4–10 mm).

Selected references

Roof planting made easy


Above the roofs of the big city


Roof planting with Liadrain