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IBA Aggregate

Brett Aggregates' Fortistone® IBA Aggregate can be used as an alternative to traditional aggregate, providing significant environmental and economic benefits over quarried aggregates.

Fortistone® IBA Aggregate is created by processing residues from the thermal treatment of household and commercial waste that is otherwise sent to landfill. Each tonne of Fortistone® IBA Aggregate used in construction diverts 750 black bags per tonne away from landfill and offers an overall reduction in CO2.

By focusing on the reuse and recycling of materials, Fortistone® IBA Aggregate helps support a circular economy, and locally sourcing material like Fortistone® IBAA means less quarried rock has to be imported into the area, its production also generates electricity for the community.

Fortistone® IBA Aggregate can be used instead of primary aggregate in a variety of civil engineering and construction settings such as bulk fill, trench fill and sub-bases, and as road paving and construction blocks.

The Fortistone production
cycle diverts 750 black bags of household waste away from landfill and supports
a ‘circular economy.

Other benefits of Fortistone® IBA Aggregate include:

  • Less tonnage is required over primary aggregates. Fortistone® has a lower bulk density than primary material – this means you will get 10 – 15% more coverage from the same tonnage.
  • Consistent product with a high performance. Fortistone® IBA Aggregate is to be used in accordance with RPS247 and is more consistent than recycled material. It has pozzolanic (cement like) properties and its Californian Bearing Ratio (CBR) results are favourable to primary material.
  • Always available. Constant production means you do not have to wait for the next cargo or rely on construction and demolition material availability.
  • A cost effective alternative to primary aggregates. No aggregate tax is payable – keeping costs down.
Recycled Aggregate Products Available:

  • Opti Mix (Fortistone®) Recycled Type 1 that complies with SHW 800 Series - Clause 803.
  • 6F4 (Fortistone®) An evenly graded material from 50mm down that complies with SHW 600 Series.
  • 1A (Fortistone®) An evenly graded material from 0 – 125mm compliant with SHW 600 Series.

Other product specifications are available. Please get in touch for more information by calling us on 01795 594000 or by sending us email at

If you would like to view or download the full Fortistone® brochure, please click here.