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Case study

Recycling Centre, Hartcliffe Way, Bristol

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October 2021


Construction of a split-level household recycling re-use centre.

Material Specification
1,000 tonnes of SHW Clause 803 Type 1 Subbase.

Bristol Waste Company.

Delivery Partner
Encon Construction Ltd.


The IBAA (Incinerator Bottom Ash Aggregate) Type 1 subbase was used an as alternative to primary aggregate. The road application was constructed with a 150mm layer of IBAA Type 1 subbase and overlayed with 200mm of asphalt.


IBAA is an extremely cost-effective material when compared to Primary Aggregates and BP UK is working towards a verified Carbon Footprint. There are also advantages logistically when using IBAA due to the low density of the material allowing for fewer vehicle movements as this gives volumetric advantages over primary materials.