Flame resistant flow-delay retention board

PRODUCT CODE: 310232 Categories: ,


  • Flame resistant ⇒ tested according to EN 11925-2
  • Class „E” fire performance ⇒ according to EN 13501-1
  • High rainwater retention ⇒ nearly 12 l/m2 of water storage capacity
  • Runoff reference value (C) 0,29 ⇒ water delay over 70% according to FLL1
  • Microbiological resistance test (EN 12225) ⇒ barrier layer, protecting the waterproofing membrane against biological  effects

DIADEM® Build-up

  • Vegetation
  • Growing media
  • VLF 150/200 filter layer
  • DiaDrain-25HF-M
  • VLU 300/500 mechanical protection layer
  • Root resistant waterproofing membraine
  • Roof construction


Flame resistant flow-delay retention board for extensive and semi-intensive green roofs and hard surface pedestrian areas, made of recycled high-impact polystyrene (HIPS). The flow-delay and the retention functions are provided by the stepped barrier design.


Flame   resistant   flow-delay   retention board for extensive green roofs made of   recycled   high-impact  polystyrene, fire  performance   tested   according EN ISO 11925-2 and certified according to EN 13501-1 class E, height 25 mm, stepped barrier form, with deep-drawn recessed evaporation vents and  wa-  ter channel system on the underside, water flow capacity on 2% roof slope  ca. 0.57 l/(m×s) certified according to EN ISO 12958, water storage capacity 11.8 l/m2, weight: 1.56 kg/m2.

Product: DIADEM® DiaDrain-25HF-M
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
Reaction to fire, EN 13501-1: E
Overlap loss: ~4%
Compressive strength (unfilled) ( kN/m2 ): 517
Compressive strength (filled) ( kN/m2 ): no structural damage at F= 1MPa
Surface weight (kg/m2): 1,56
Material: HIPS
Water flow capacity, DIN EN ISO 12958 (l/m*s): at 2%: 0,57 • at 3%: 0,71 • at 5%: 0,91
Storage: store horizontally, for longer-term storage protect from UV radiation

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