drainage board perforated on both sides

PRODUCT CODE: 310240 Categories: ,


  • Lower and upper openings for water drainage fast water drainage of excess storage water
  • Very good drainage properties unhindered water drainage between retention element and sealing membrane
  • Negligible overlap loss economical installation

DIADEM® Build Up

Growing media
VLF-150/200filter layer
VLU-300/VLS-500 mechanical protection layer
Root resistant waterproofing membraine
Roof construction


Drainage panel with flow retardation and residual water storage made of recycled, impact-resistant polystyrene, 40 mm high, graduated barrier shape, with recessed evaporation openings, with drainage openings at the bottom and with water channel system at the bottom.


Drainage board, perforated on both sides, made of high-impact polystyrene, height 40 mm, with lower and upper drainage openings of paved/wooden surfaces of roof areas and for gravel roof build-up. Water flow capacity at 2% roof slope is 1,01 l/m×s certified according to EN ISO 12958, microbiological resistance tested (EN 12225).
Product: DIADEM® DiaDrain-40H-DeReT
Producer’s certificate: A.P.P. Kft.
Website: www.diadem.com

Technical data

Board size (mm):approx. 2040 × 1040 × 40 [ca. 2.12 m2 / sheet]
Rainwater retention capacity ( l / m2): 8.2
In-fill volume (l / m2):22,75
Overlap loss:~5%
Surface weight (+/-5%, kg / m2):1,96
Compressive strength unfilled (kN / m2):> 210
Material:recycled high-impact polystyrene (HIPS)
Water flow capacity EN ISO 12958 (l / m×s):at 1%: 0.70 • at 2%: 1.01 • at 3%: 1.25 • at 5%: 1.63
horizontally, for long-term storage protect from UV radiation
Installation:adjacent to each other or overlapped

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