Thanks for the above posts. Is it possible to explain the differences between the concrete carbon factors (A1-A3) from the eTool UK LCI dataset vs BRE IMPACT and the ICE datsets – For example the eTool UK LCI dataset has a A1-A3 carbon factor for concrete (40mPA) of approx. 0.2kgCO2e/kg, where as the BRE IMPACT RC40 concrete is closer to 0.15kgCO2e/kg, and the ICE is 0.14-.0.15kgCO2e/kg.

For a large building this has quite large impact on the total results and how they therefore compare to industry benchmarks (e.g. RIBA 2030, LETI etc). It is therefore quite important that we understand the differences in the carbon factors in the tools, particular for such key materials in buildings. The comparison between the eTool and BRE IMPACT LCIs seems odd consideirng they both use ecoinvent?

We are also increasingly having our results compared to other disciplines carrying out similar exercise using their own tools or the iStructE carbon tool (i.e. the ICE database), so any insight into this would be appreciated to back up our results.