Extensive green roofs.
Extensive sedum roof.
An extensive green roof often has a growth layer of 50 to 100mm, upon which only drought-resistant plants can plant, e.g. succulents, bulbs, and mosses.
The weight of the sedum covering is approximately 50kg/m2 in its water-saturated state.
Mosses and sedum vegetation usually require no root-securing membranes, as these plant’s roots are harmless to conventional membranes. An inspection of the roof must ensure that there is no vegetation with strong, deep roots.
Moss sedum roof, 0 to 4 degree slope
Moss sedum roof, 2 to 27 degree slope.