Case study

Rock Carpark, Cornwall

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December 2018


Raising levels for the Rock carpark extension. 

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

Delivery Partner
Bridge Civil Engineering.


IBAA (Incinerator Bottom Ash Aggregate) Type 1 subbase was used to raise levels, cover trenches, and form a subbase layer of 240mm under asphalt for access and carpark construction to increase the carpark by 50 spaces.


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.