There are two parameters to consider during the installation process of ECCOsedum green roofs:

  • Prevention of washout or shearing of the substrate
  • Shearing of the entire green roof system due to the incline of the roof

For these reasons, the roof incline is limited. For slopes of up to 15°, the system can be installed without additional precautions.

  • Gradient between 0 and 3° (0 to 5%)
    The ECCOsedum system can be placed without any additional precautions.
  • Gradient higher than 3° (over 5%)
    The ECCOsedum system can be placed without any additional precautions. Thanks to the specific construction of ECCOsedum green roofs, erosion protection is not necessary for these kinds of slopes.
  • Gradient higher than 15 to 20° (27 to 36%)
    Here, an additional system is installed to prevent the shearing of the substrate layer. Such systems can be divided into two groups. (1) Systems that reduce the gradient by means of a stepped system (similar to a terrace structure) or (2) systems that divide the substrate layer into compartments by means of a slat system. The distance between adjacent slats is determined by the gradient.
    –>> Slat systems can in turn be divided into (a) slat systems installed underneath the roof waterproofing: these can be made out of wood and have a longer lifespan but require an additional protective layer if the slats do not have rounded edges. This is to prevent damage to the water-retaining layer. The additional water retention that can accumulate behind the slats also has a negative effect on shifting of the substrate layer or (b) slat systems applied above the roof waterproofing: the slats are generally made of plastic. For inclines up to about 11° (20%) they may also be made out of wood. The wood will decay over the years, but as the substrate becomes rooted throughout, the substrate layer is firmly anchored. A slat system that is installed above the roof waterproofing has the advantage of not influencing the roof waterproofing and not causing water stagnation.