Incorporating Lytag horticulture aggregate (Hortag) within the build-up can greatly reduce the loading on the structure as well as aiding in the moisture transfer.

Lytag as a secondary aggregate will omit the need for natural aggregate within the Green roof build-up while providing greater water dispersion and attenuation, a suitable medium for sustaining vegetation and reducing the overall weight.


Intensive, extensive, or simple intensive green roof systems.

ISO 9001, 14001 and 18001 certificates, BES 6001 certificate (excellent rating).

Standard product features

Technical characteristics:

  • Grade: 8/14 mm.
  • Loose bulk density: 750 kg/m³ (oven dry).
  • Water absorption: 30 minutes: 12.4% by mass, 24 hours: 15.2% by mass.


862 kg/m³ based on a moisture content of 15%. This may however vary slightly. Bulk densities are also available.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-06/352 Lightweight general aggregates

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Aggregate Industries – Lytag


+44 (0)207 4995242

Product reference


Manufacturer details

Drax Power Station,
North Yorkshire, YO8 8PH
Tel +44 (0)207 4995242
Fax +44 (0)1904 720181
NBS Plus