Street Ash Nursery, Combe St. Nicholas, Chard, Somerset, TA20 3HZ, UK
+44 (0) 3335 771 500
enquiries@blackdown.co.uk

Extensive Sedum Green Roof System

SPECIFICATION DRIVERS

Applicable to both new build and retrofitting. Designed to replicate the benefits derived from open green spaces, extensive living roofs are virtually self-sustaining and require no irrigation.

MAINTENACE

By their nature, extensive type green roofs are low maintenance. Once established they will not require supplementary irrigation and will continue to develop to create a self-sustaining plant community.

Blackdown Greenroofs Extensive Sedum Build Up
PLANTING & SPECIES

A variety of hardy sedums, both native and non-native. These provide aesthetic interest and diversity. This planting can be offered at as NatureMat, offering 95% coverage or Plug Plants, offering 5-10% coverage upon installation.

BUILD UP HEIGHT & WEIGHT

Typically, the total depth of the green roof would be 100mm (20-25mm drainage layer & 70mm of substrate) and weight approx. 100kg per sqm.

Further Detailed Information

In order to help make your selection of our green roof system as simple as possible you will find all the relevant documentation needed for your specification and designs below.

Blackdown Greenroofs download button

Key Features

Extensive sedum green roofs utilise drought tolerant plant species which are typically sedum species. Grown in a shallow layer of lightweight, low nutrient growing media.

Applicable to both new build and retrofitting. Designed to replicate the benefits derived from open green spaces, extensive living roofs are virtually self-sustaining; requiring minimal maintenance and, in the vast majority of projects, no irrigation. These roofs are not designed to be trafficked and can be installed on adapted roofs up to 45 degrees.

Other reasons why an extensive green roof may be considered; enhanced sustainable drainage, improved bio-diversity, countering the heat island affect, enhance the visual amenity & well-being of occupants and offer indirect financial benefit i.e. extending the life of the waterproofing.

Blackdown Greenroofs Sedum Roof
Blackdown Greenroofs extensive sedum plants

Design, Planting and Waterproofing

Typically, the total depth of the green roof would be 100mm (20-25mm drainage layer & 70mm of substrate) and weight approx. 100kg per sqm.

A variety of hardy sedums, both native and non-native. These provide aesthetic interest and diversity. This planting can be offered at as NatureMat, offering 95% coverage or Plug plants, offering 5-10% coverage upon installation.

Waterproofing options include Alumasc's Derbigum and Euroroof Mastergold membranes, Hydrotech structural waterproofing and standing seam.

Blackdown Greenroofs Maintenance

Installation and Maintenance

Blackdown green roofs can be installed by the Blackdown in-house Contracts Division or by Alumasc's nationwide network of Registered Contractors

Typical procedures carried during maintenance include:

  1. Removal of unwanted plant material i.e. invasive species (if required)
  2. Correction of any localised plant system problems that may have occurred post installation
  3. Replacement of any failed plants
  4. Application of nutrient source
  5. Removal of dead flower heads (if required)
  6. Inspection of rainwater outlet chambers and surrounding vegetation breaks
  7. Replenishment of any areas of settled substrate

As a general guide, it is recommended that maintenance be carried out two or three times in the first year and once or twice in each subsequent year but this depends on the type of system installed and the rate of plant cover.

Temporary irrigation is required for a period of 6-8 weeks until the plant material is established, once it has reached this point no additional irrigation should be required.