Blackdown Extensive Green Roof

Extensive Green Roof


Blackdown extensive green roofs are lightweight with a relatively shallow substrate, providing a versatile range of planting generally comprising of drought tolerant succulents such as sedum, rockery and alpine plants.


Key Features & Applications

  • Blackdown extensive green roofs are suitable for lightweight roof decks, inaccessible roofs, flat or sloping roofs and are equally suited to re-roofing or new build projects
  • They are versatile, economic and can provide ecological and economic benefits. Their incorporation on the roof can result in reduced water run-off
  • Blackdown green roofs comply with the UK’s GRO Green Roof Code of Best Practice 2011 and the German Landscaping and Landscape Development Research Facility (FLL) Guidelines

Design, Planting & Waterproofing

  • Extensive green roofs have a typical build-up height of 100mm (including drainage layers) and do not normally require irrigation once they are established
  • Planting options include Naturemat, plug plants or sedum cuttings and typically consists of sedums inlcuding alpine and rockery plants. Sedum-type plants are self-sustaining and wind, frost and drought resistant
  • Variation within the system can be achieved by using different substrate formulations and depths to support rockery and alpine plants
  • Waterproofing options include Derbigum membranes, Euroroof Mastergold membranes, Hydrotech structural waterproofing and standing seam roofing 

Installation & Maintenance

  • Blackdown green roofs can be installed by Alumasc's nationwide network of Registered Contractors
  • Blackdown extensive green roofs are easy to install, do not require a permanent irrigation system and need minimal maintenance
  • Warranties are available for the Alumasc waterproofing system used in the green roof build up 

Typical Planting Options

Featured Project

The SnowdomeThe Snowdome

White House Works, Bold Road, Sutton, St Helens, Merseyside, WA9 4JG