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Why method matters: temporal, spatial and physical variations in LCA and their impact on choice of structural system

Moncaster, A. M.; Pomponi, F.; Symons, K. E. and Guthrie, P. M. (2018). Why method matters: temporal, spatial and physical variations in LCA and their impact on choice of structural system. Energy and Buildings, 173 pp. 389–398.

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Life Cycle Assessment (LCA) is increasingly used as an early-stage design-decision tool to support choices of structural system. However LCA modellers must first make numerous methodological decisions, and the resultant wide variations in approach are often inadequately described by the modellers.

This paper identifies, and quantifies, the three major areas of methodological variation. These are: temporal differences in the stages considered; spatial differences in the material boundaries; and physical disparities in the data coefficients. The effects are then demonstrated through a case study of a student residential building in Cambridge. The cross-laminated timber (CLT) structure is compared with concrete frame, steel frame and load-bearing masonry, considering the influence that varying the temporal boundaries, the data coefficients, and the spatial boundaries has on the choice.

While for this building CLT is confirmed as the lowest impact material, the paper demonstrates that varying the methodological choices can change the results by an alarming factor of 10 or even more. The findings confirm the need for the utmost clarity and transparency with all LCA calculations. Making wider industry or policy decisions based on LCA results should be undertaken with extreme caution.

Item Type: Journal Item
Copyright Holders: 2018 Elsevier B.V.
ISSN: 0378-7788
Keywords: embodied carbon; embodied energy; Life Cycle Assessment; structural material; case study analysis
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Design and Innovation
Item ID: 55145
Depositing User: Alice Moncaster
Date Deposited: 22 May 2018 15:52
Last Modified: 19 Feb 2019 11:40
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