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
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