Technical specifications Green Roofs

ECCOsedum = combination of the highest-performance substrate + the lowest weight:

Weight (with sedum growth)

per tray

per m²

dry state

8 kg

30 kg

saturated state

12.5 kg

55 kg

Dimensions: 45 cm x 49.5 cm x 8.5 cm (4,4 tiles/m²)

The ECCOsedum® green roof tiles consist of five layers (from top to bottom):

  1. Vegetation layer
    The succulents can survive in a limited substrate layer (limitation of roof load) and have an easier time tiding over dry spells in comparison with other plants. The ECCOsedum system makes use of at least 7 types of sedum which are fully rooted and grown thick (not giving weeds a chance). Mature plants, well-rooted in the substrate, are the best guarantee for a perfect, fully-grown green roof. Each type is planted in proportional quantities for a uniform distribution.
  2. Substrate layer
    The substrate layer has multiple purposes. It provides nourishment and water to the vegetation, supplies oxygen, and anchors the roots. To this end, ECCOsedum uses roof garden substrate with the following composition: washed pumice stone 4 - 8 mm: 40%, lava 3 - 8 mm: 35%, coconut fibre: 15%, garden turf: 10%. As far as vegetation is concerned, this is the most important layer. Its thickness is adapted to the requirements of the sedum types used and the climatic conditions of our climate zone. The following properties are of vital importance: (a) low weight, (b) high water buffering capacity, (c) balanced nutrient medium, and (d) guaranteed constant quality.
  3. Filtration layer
    This layer keeps the substrate from washing away. A non-woven 150 g/m² polyester cloth retains the fine particles in the substrate. The weight of the cloth is selected to ensure that no ballast salts (see maintenance) can accumulate in the cloth. An overly heavy cloth may cause plant death.
  4. Water buffering layer
    Water buffering helps the plants survive dry spells. Therefore, the lower half of the tray ensures buffering of the rainwater. However, stagnant water during a period of rest (winter season) may cause root rotting. The ECCOsedum green roof system has provided a solution to this problem as well by means of capillary water buffering in a slightly expanded broken clay grain substrate (fractions: 4 - 8 mm). To prevent stagnant water from accumulated in the voids of the clay substrate, drain holes have been provided in the top and bottom of this layer. Any excess will be drained this way. The bottom drain holes are located at 1 cm from the bottom, so that non-capillary water can be stored as well. Tests have shown that this does not negatively impact root growth and also ensures an additional buffer.
  5. Drainage layer
    Drainage allows excess rainwater to be efficiently drained on top of the roof membrane, without hindering catchment.