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The use of sedum on extensive green roofs

The composition of an extensive green roof consists of several layers, each with its own function. In a standard composition, the following layers will be placed on top of the roofing system:

  • root resistant layer;
  • separation and protection;
  • drainage layer;
  • filter layer;
  • vegetation bearing layer - substrate layer;
  • vegetation layer.;

The different layers must be attuned to each other in such a way that the functionality of the whole composition is ensured. Each layer has its function in the green roof build.

It is possible that one function layer is composed of multiple products or one product that has multiple functions. SD Drainage systems show a good example; they are not only the drainage and filter layer, but also act as  the separation and protection layer.

Flat roof

Extensief _voldoende _afschot _warm _of _ongeisoleerd _dak

1. SD Blanket - Sedum, SD Plug plants or SD Sedum cuttings;
2. SD DGS-E Substrate Extensive;
3 t/m 5. SD 4+1h Drainage System*;
6. Root-resistant waterproofing membrane, optional ND WSB-80 Root-Resistant Sheet: if the waterproofing membrane is non-root-resistant.

*Also suitable for an inverted roof-construction.

Roof with insufficient fall

Extensief _onvoldoende _afschot

1. SD Blanket - Sedum, SD Plug plants or SD Sedum cuttings;
2. SD DGS-E Substrate Extensive;
3 t/m 5. SD 5+1 Drainage System*;
6. Root-resistant waterproofing membrane, optional ND WSB-80 Root-Resistant Sheet: if the waterproofing membrane is non-root-resistant.

*Also suitable for an inverted roof-construction.

Medium pitched roof

Hellend Dak 15-25graden Eenlaags (3)

1. SD Blanket - Sedum;
2. SD DGS-M Substrate Mineral;
3 t/m 4. SD 5=1 ESN Erosion Protection System*;
5. Root-resistant waterproofing membrane, optional ND WSB-80 Root-Resistant Sheet: if the waterproofing membrane is non-root-resistant;
6. Roof construction.

*Also suitable for an inverted roof-construction.

Steep pitched roof

Hellend Dak 25-45graden (9)

1. SD Blanket - Sedum;
2. SD SM-50 Substrate Panels;
3. SD ESG-40/40 Erosion Protection Grid;
4 + 5. SD 200 Drainage System;
6. Root-resistant waterproofing membrane, optional ND WSB-80 Root-Resistant Sheet: if the waterproofing membrane is non-root-resistant;
7. Roof construction.