High rainwater retention→ca. nearly 12 l/m2 of water storage capacity
Delayed rainwater runoff→stepped barriers avoid overuse of wastewater channel system
Runoff reference value (C) 0,29→water delay over 70% according to FLL1
Microbiological resistance test (EN 12225)→stepped barriers avoid overuse of wastewater channel system
Recessed evaporation vents→unobstructed aeration
Negligible overlap loss→economical installation and cost savings
Increased contact area→decreased surface pressure
Vegetation
Growing media
VLF 150/200 filter layer
DiaDrain-25H
VLU 300/500 mechanical protection layer
Root resistant waterproofing membraine
Roof construction
Flow-delay retention board for extensive and semi-intensive greenroofs and hard- surface pedestrian areas, made of recycled highimpact polystyrene (HIPS). The flow-delay and the retention functions are provided by the stepped barrier design.
Flow-delay retention board with CE marking, made of recycled high-impact polystyrene, 25 mm high, stepped barrier form, with deep-drawn recessed
evaporation vents and water channel system on the underside, compressive strength 322 kN/m2 (unfilled), water flow capacity on 2% roof slope 0.57 l/m*s
certified according to EN ISO 12958, water storage capacity 11.8 l/m2, runoff reference value according to FLL: 0,291, microbiological resistance tested (EN
12225), fire resistance classification “BROOF(t2)” (EN 13501-5), laid.