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NBS Source

Intensive Green Roof with Deckdrain 25mm Drainage Board


The Intensive Green Roof system typically consists of a combination of hard and soft landscaped finishes that create valuable mixed use roof garden and podium amenity areas at roof level.

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Various applications dependant on Deckdrain options selected.


Utilising a high strength drainage composite such as ABG Deckdrain 25mm provides the adequate sub-soil drainage required for larger scale planting and podium deck paving areas found in intensive green roof garden applications. The ABG Deckdrain prevents water-logging of the soils during periods of heavy rainfall. The high strength core used in ABG Deckdrain allows the product to be used in high load areas such as on podium decks with vehicular traffic.

ABG Deckdrain consists of a combination of a cuspated core with a geotextile fleece bonded to the upper face. It is manufactured in the UK from up to 95% recycled material bonded to the upper face.

Green Roof Intensive comprises:

- Engineered growing media:

ABG peat free media derived from sustainable, recycled, UK sourced materials. Using a specifically developed growing media can help provide the right growing environment for the selected vegetation and also reduce the load on the roof.

- Vegetation/ Surfacing:

On Intensive green roofs a wide variety of vegetation can be used from grasses to shrubs and trees as well as hard surfacing such as pavers and block paving.

- Deckdrain:

Forms a lightweight high performance drainage layer with integrated filter geotextile that eliminates clogging within the drainage structure that provides a continuous drainage layer across the structure.

It provides excellent drainage over the whole base area of the soil layer as well as providing additional waterproofing protection. With more emphasis on reducing the amount of carbon used in construction, recycled materials can provide additional environmental benefits.

Features and benefits:

  • Added protection for waterproofing layer.
  • Scores BREEAM points.
  • Reduces whole life costs of the building and its energy usages.
  • Part of SuDS solutions acting as the first stage in the treatment train.
  • Can create a useable space.
  • Creates habitat to improve biodiversity.
  • Noise reducing.
  • Extracts pollutants and improves air quality.

General information




50000 mm


1100 mm


25 mm


Equal to the life of the biodiverse roof maintenance contract.


Ss_45_40_47_40 Intensive green roof systemsPrimary


Q37/110 Intensive green roof

Product range

Biodiverse Roofs

Specification data - Intensive green roof systems



Root barrier


Not required

Moisture control


Drainage layer

ABG Deckdrain 700.

  • 7 mm thickness.
  • Flow rate: 0.67.
  • Puncture resistance: 2400 N.
  • Typical applications: Smaller podium decks and car parks where outlets are closely spaced.

ABG Deckdrain 1200.

  • 12 mm thickness.
  • Flow rate: 1.25.
  • Puncture resistance: 2300 N.
  • Typical applications: Larger podium decks and car parks where outlets are less frequent.

ABG Deckdrain 2500.

  • 25 mm thickness.
  • Flow rate: 4.30.
  • Puncture resistance: 4800 N.
  • Typical applications: Applications where large volumes of water will be travelling over large distances in podium deck and green roofs.

ABG Deckdrain 5000.

  • 50 mm thickness.
  • Flow rate: 29.00.
  • Puncture resistance: N/A.
  • Typical applications: Used as part of a SUDS attenuation system.

Filter membrane


Planting systems


Planting medium

Manufactured growing media.

Planting requirements

On Intensive green roofs a wide variety of vegetation can be used from grasses to shrubs and trees as well as hard surfacing such as pavers and block paving.


Environmental information

Recycled content

95 %

Up to 95%.

Digital objects

Platform Compatible Version Certified to




Revit 2017


Download now from NBS National BIM Library


Green Roof brochure

Green Roof brochure

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Biodiverse Green Roof with Roofdrain 25mm Drainage Board

Biodiverse Green Roof with Roofdrain 25mm Drainage Board