Icopal Drainage Board 20 FF meets the need for free drainage within any green roof

BMI Canopia FKD 40 Drainage and Storage Board

The need for free drainage within any green roof is vital to prevent the system from becoming waterlogged and to reduce excess loadings on a roof deck. 
BMI Canopia FKD 40 Drainage and Storage Board creates a 40 mm free-draining void to allow excess water to move swiftly and unhindered to the relevant roof drainage outlet.


BMI Canopia FKD 40 Drainage and Storage Board is a black, high density polyethylene (HDPE) cuspated drainage board. The board is manufactured from 100 % recycled HDPE. The drainage board has ribbed cups provide additional resistant to compression. The top surface of the drainage board is perforated to allow excess water to pass through and drain away. 

Product Code Description Size
3103169 BMI Canopia FKD 40 Drainage and Storage Board 2m x 1m x 40mm


Pack Size: LxWxH: 2m x 1m x 40mm


Recycled HDPE
Nominal thickness: Approx. 40 mm
Grammage: Approx. 2,300 g/m2
Colour: Black / grey

Compressive strength:

Approx. 280 kN/m
Filling volume: Small naps facing up (lettering readable); approx. 160 L/m2
Water reservoir unfilled: Small naps facing up (lettering readable); approx. 8.7 L/m2
Delivery weight:

Approx. 4.6.kg per panel

Approx. 1,405 kg per disposable pallet

Quantity / delivered unit:

2 m2 per panel ( 2 m x 1 m)

6,00 m2 per pallet

Water discharge capacity: 

           Gradient Water Flow Rate
  i = 0.01 (= 1 % roof pitch): 1.60 L/(m*s)

i = 0.0.2 (= 2 % roof pitch):

2.31 L/(m*s)
  i = 0.05 (= 5% roof pitch): 3.76 L/(m*s)
  i = 1 (vertical): 16.64 L/(m*s)



BMI Canopia FKD 40 Drainage and Storage Board has been tested in accordance with DIN ES ISO 12958: Drainage.

Intended Use

BMI Canopia FKD 40 Drainage and Storage Board is intended for use as a drainage and storage board under extensive green roofs with increased iLayer structure (nature roof up to 250mm), and under simple intensive green roofs with low layer structure (garden roof up to 300mm). Suitable for long flow routes due to high drainage performance. Not suitable for under floor surfaces. 

Specific Properties

  • 100% recycled HDPE.
  • CE-marked CE-1213-CPD-4265
  • Drainage according to DIN 4095.
  • Safe and targeted guiding of excess water.
  • Depositing if water in the recesses.
  • Low weight
  • Suitable for non-pitched roofs.
  • Lightweight super structure with high drainage capacity.
  • Recyclable.

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