This is great stuff, @ksimonen and team!
We routinely provide embodied carbon comparisons to design teams, often use EPDs for the same.
Even when we’re not using EC3, we do try to address the inherent uncertainties in EPD comparisons, and try to minimize those by intuitively and qualitatively applying the data quality factors you have in the paper: for e.g. 1) comparing product-specific EPDs to other product-specific EPDs; 2) not focusing on the actual numbers too much when having to compare industry-wide EPDs to each other or product-specific EPDs, but the order of magnitude of differences, 3) not comparing across PCRs unless it’s a larger system-level LCA, etc
Have you found that using the uncertainty-adjusted GWP values gives you very different procurement recommendations than what you’d have gotten if you were simply using the EPD’s GWP values as is? (Of course, adjusted for units and quantities needed for same function)
Or is the uncertainty-adjustment intended more for situations when teams are trying demonstrate a specific % GWP reduction - required by say the LEED EC3 Pilot Credit or ILFI ZCC or a client goal?