Roofdrain Drainage Board

Roofdrain Render

The design of intensive green roofs requires a structural drainage layer (Deckdrain); by contrast the modern method of an extensive green roof requires a combination of efficient drainage and water attenuation in order to allow the ecology to flourish.

Roofdrain allows the storage of water within the storage of water within the nodes of the HDPE core whilst facilitating the efficient drainage of any excess water away from the roof.  This helps prevent the root growing media from drying out during dry periods and from becoming waterlogged during wet periods.

When used within a roof construction Roofdrain provides a versatile system for the collection of surplus seepage water at the base of the growing medium and for the prevention of water pressure on the structural waterproofing.


  • Prevents plants from dying out
  • Prevents waterlogging
  • Provides drainage
  • Assists in roof cooling
  • Lightweight
  • Easy to install
Thickness Reservoir Capacity (l/m2) Typical Applications
Roofdrain 20 20mm 5.5 Below substrate layers 75mm down including extensive and brown roofs.
Roofdrain 25 25mm 4.3 Standard grade product. Below substrated layers 150mm down including extensive and brown roofs. It is particularly useful on pitched roofs due to the profile of the cone shaped cuspates.
Roofdrain 40 40mm 12 Used to store additional rainwater allowing greater diversity of vegetation.
Roofdrain 60 60mm 23 Used to store large volumes of rainfall and significantly reduced run-off.


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