Flow-delay retention board

PRODUCT CODE: 310203 Categories: ,


  • 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

DIADEM® Build-up

  • 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.

Product: DIADEM® DiaDrain-25H.
Manufacturer’s Certificate of Origin (MCO): APP Kft.
Website: www.diadem.com

Technical data

Board size (mm): 2020 × 1100 × 25
Rainwater retention capacity (l/m2): 11,8
Runoff reference value (C)1: 0,29
Overlap loss: ~3%
In-fill volume (l/m2): 13,5
Surface weight (kg/m2): 1,36
Fire resistance classification (EN 13501-5) alapján: BROOF(t2)
Compressive strength (kN/m2): 322
Material: recycled high-impact polystyrene (HIPS)
Water flow capacity (EN ISO 12958) (l/m*s): at 2%: 0,57 • at 3%: 0,71 • at 5%: 0,91
Storage: store horizontally, for long-term storage protect from UV radiation
Installation: adjacent to each other or overlapped, cover immediately after laying
Production: Made in Germany

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