Shire Green Roof Substrates Ltd

Shire Biodiversity Substrate

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Substrate Description

Lightweight substrate made from coarse recycled brick and aircrete, green waste compost and medium clay soil.

Substrate Application

General purpose green roof growing media for biodiversity and brown roofs

  • Also for localised areas of biodiversity on extensive and intensive roofs
Technical Information (Typical)
Size: Sieve Size (mm) % passing Biodiversity substrate for green roofs 
Photo Courtesy: Frost Landscapes Limited
16 78
4 50
  <0.063 12.9
pH value: 8.78
Soil Organic Matter [SOM]: 3.7%
Maximum Water Holding Capacity: 32.9% vol.
Driest days of Summer
FLL Maximum
water capacity
Design maximum
m3 935 1264 1500
1 sq m @ 100mm 94 126 150
1 sq m @ 25mm 23.4 31.6 37.5
Packaging: Supplied by bulk tipper load, in multitrip 1 m3 Big bags or 25kg sacks

The above information is issued in good faith and without warranty and is intended as a guide only. The information comprises typical data and does not constitute a specification. Specification values are available separately upon request.

The Manufacturing Process

The manufacture of house bricks and aircrete blocks generates a percentage that do not meet the rigorous quality standards required for house building, for instance because of cracks or other damage and are scrapped. These cannot easily be reprocessed and they are set aside and crushed for use in other applications, e.g. as
lightweight aggregates or for use as green roof growing media.

The bricks used for this substrate are manufactured with Victorian wastes from London collected the 1880’s and transported to the brickworks by Thames barge. The characteristics of the crushed brick used for biodiversity include some larger size pieces to provide shade and microclimates for plants and invertebrates.

Green Compost

Where the growing media incorporates compost it is derived from a sustainable source, normally green waste compost to PAS 100, derived from horticultural wastes collected during municipal works, e.g. hedge trimming, etc.

Biodiversity Substrate with green compost from pine bark.

The Whittington Park changing rooms, Whittington Park, London N19