This site uses cookies to store information on your computer. Learn more about these cookies, and how to opt out of them. Find out more

NBS Source

Biodiverse Green Roof with Roofdrain 25mm Drainage Board


The Biodiverse Green Roof is commonly used where the vegetation layer is intended to replace or replicate the existing site habitat.

Jump to:
+44 (0)1484 852096 Website


Biodiverse green roof installations.


Utilising a drainage composite such as ABG Roofdrain, reduces the risk of over saturation of the soil media and planting during periods of heavy rainfall. The high strength drainage core of the ABG Roofdrain product is designed to be used for higher load biodiverse green roof system applications, with a typical depth of between 80 - 150mm of growing media and with typical loads ranging from 100 – 200kg per m2.

The product consists of a combination of a cuspated core with a geotextile fleece bonded to the upper face to prevent soil ingress. It is manufactured in the UK from up to 95% recycled material.

The ABG Green Roof biodiverse system comprises:

- Engineered growing media:

ABG peat free media derived from sustainable, recycled, UK sourced materials. Using a specifically developed, light-weight growing media also reduces the load on the roof.

- Surfacing:

A vegetation layer, such as wildflower seed and sedum plug plants and habitat enhancement features (e.g. hibernaculums, stone and log piles).

- Roofdrain 25mm drainage / reservoir board:

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

Features and benefits:

  • Added protection for waterproofing layer.
  • Contributes to overall BREEAM assessment.
  • Reduces whole life costs of the building and its energy usage.
  • Part of SuDS solution acting as the first stage in the treatment train.
  • Creates habitat to improve local biodiversity.
  • Noise reducing.
  • Extracts pollutants and improves air quality.

General information




50000 mm


920 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 Roofdrain 25 mm.

  • Water Storage Capacity - 4.3 L/m².
  • Typical applications: Roofdrain is designed for use in extensive green roof systems. It provides both drainage and attenuation in a convenient, lightweight and cost effective 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%

BIM objects

Platform Compatible Version

Revit 2017






Green Roof brochure

Green Roof brochure

Similar products from ABG

Intensive Green Roof with Deckdrain 25mm Drainage Board

Intensive Green Roof with Deckdrain 25mm Drainage Board