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Public roof - inverted roof

Traffic areas can also be realized on inverted roofs, but require adapted construction methods. All functional layers must be sufficiently permeable to water vapor so that the insulation material does not absorb too much water. The resulting compressive stresses from permanent load and variable load (traffic load) must also be determined and matched to the compressive strength of the insulation material.

System structure public roof - inverted roof

Note: Click on the marked points to get more information!

Paving

  • Height 60-120 mm
  • 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 0-32 mm or 0-45 mm (0-22 on heights less than 120 mm)

Filter fleece FIL 300

  • Prevents fine particles from forming sludge in the drainage layer
  • high water permeability
  • very high robustness class GRC 5
  • learn more: Filter fleece FIL 300

Building protection and drainage element FKD 60BU

Trickle protection fleece RSV 120

Protection, seperation and slip layer SGL 500 and seperation and slip sheet TGF 0.2

Technical specifications

Weightfrom 400 kg/m² or 4.0 kN/m²
Build-up depthfrom 250 mm
Roof pitch*1-5°
Load class1-2 (max. 2,5 t vehicle weight)

* Roofs with zero degree falls do not meet FLL Green Roof Guidelines and Optigrün systems should not be used without consultation.