Shire Green Roof Substrates Ltd

Shire Extensive Substrate

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Substrate Description

Lightweight substrate made from recycled bricks, compost and medium clay soil

Substrate Application

General purpose green roof growing media for extensive roofs

  • Substrate for sedum mat (25-60m)
  • All kinds of extensive green roof, e.g. NBS Q37 Clause 390
  • Simple intensive green roofs, e.g. NBS Q37 Clause 380
  • Biodiversity roofs and small domestic green roofs
Technical Information (Typical)
Size: Sieve Size (mm) % passing Extensive substrate for green roofs 
Photo Courtesy: Bere.architects
16 99.5
4 66.8
  <0.063 15
pH value: Av. 8.4
Total pore volume: 47 - 60%
Soil Organic Matter (SOM): 6.5%
Maximum water holding capacity: 30% vol.
Driest days in Summer
FLL Maximum
water capacity
Design maximum
m3 870 1170 1445
1 sq m @ 100mm 87 117 145
1 sq m @ 25mm 21.7 29.3 36.1
Packaging: Supplied by bulk tipper load, in multi trip 1 m3 big bags and 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 generates a significant percentage of bricks 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.

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.

Extensive Substrate used on with plug planted sedum

Adnams Cellar & Kitchen - Photo Courtesy: Permanite Ltd

Adnams Cellar & Kitchen (Southwold, Suffolk)

4.2m3 of extensive substrate were supplied on behalf of Permanite Engineered Roofing Systems in 25kg sacks as access to the roof was rather difficult with bags needing to be moved manually. The roof was completed with sedum matting and has matured nicely with a lush carpet of sedum. The contractor was T H Moss & Sons Ltd.