We started our baseline with a concrete frames then shifted to steel structures in the proposed design. is this shift accepted toward building LCA optimization?

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Sarah Buffaloe

Associate, Built Ecology

WSP USA

LEEDuser Expert

6 thumbs up

Fri, 04/14/2023 - 17:48

Hello Ahmed. Yes this is an accepted strategy for LCA optimization. Make sure the building GSF didn't change more than 5% in the baseline vs. proposed case to meet the criteria for comparability. Very interesting study! Please share what your team learned!

Ahmed Abd El Fattah

LEEDuser Basic Member

1 thumbs up

Sun, 04/16/2023 - 01:27

Sure Sarah. Thanks a lot.

Afogreen Build

www.afogreenbuild.com

Green Building Consultant

LEEDuser Premium Member

249 thumbs up

Wed, 07/19/2023 - 04:34

Hi Ahmed, Yes, agree with Sarah.
As stated in LEED guide, “No impact category assessed as part of the life-cycle assessment may increase by more than 5% compared with the baseline building.” (Page 496).
And you may should include a narrative of how the life cycle assessment was conducted and the changes made to proposed buildings in order to optimize the LCA. Best regard – Afogreen Build Team

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Changing structural systems between the baseline and proposed design

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