Succession of layers from the inside
  • high-gloss white multiplex plywood counter-ceiling with 120 mm space above
  • 83 mm tall polyester coated corrugated sheet steel profile in 1.5% inclination sideways, profiled ROCKWOOL mineral wool thermal insulation between the waves
  • vapour barrier membrane
  • root-resistant PVC-P or PE-LD water proofing layer
  • protective layer against mechanical stress
  • rainwater retaining and surface-drainage system
  • soil and vegetation of drought tolerant rock-garden plants and wild flowers