Public roof - walkable
Accessible roof surfaces are paths and areas that can be used by people. They can be combined as a green roof system with green areas.
Walkable green roof systems and traffic areas can be used on uninsulated roofs as well as on warm and inverted roofs. The system structure below shows the structure on an uninsulated roof.
System structure public roof - walkable
Note: Click on the marked points to get more information!

Paving
- 60 - 120 mm, according to the load requirement
- Surface layer (e.g. interlocking paving, slabs, concrete)
Bedding material
- E.g. bedding stone chippings 0–5 mm (30–50 mm)
- Screed layer for surfacing material
Base layer
- Base layer of gravel 0–22 or 0–32 mm (100–200 mm)
- Provides load-bearing capacity and distribution and is used to create inclines
- Lightweight build-up with Optipor
Building protection and drainage element FKD 10
- 10 mm, for pedestrians > 2 % slope, pressure resistant, open to vapour diffusion, lightweight with high drainage capacity
- learn more: Protection and drainage element FKD 10
Protection, seperation and slip layer SGL 500 and seperation and slip sheet TGF 0,2
- learn more: Protection, Seperation and Slip Layer SGL 500
- learn more: Seperation and Slip Sheet TGF 0,2
Technical specifications
Weight | from 400 kg/m² or 4.0 kN/m² |
Build-up depth | from 180 mm |
Roof pitch* | 1-5° |
Load class | 1 (max. 4 kN/m²) |
* Roofs with zero degree falls do not meet FLL Green Roof Guidelines and Optigrün systems should not be used without consultation.
Downloads
- Checklist (pdf) 175 KB
- CAD-Drawing (pdf) 1 MB
- CAD-Drawing (dwg) 588 KB