Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub

    Description

    Documenting the environmental performance of building products is becoming increasingly common. Creating environmental product declarations (EPDs) based on life-cycle assessment (LCA) data is one approach to provide scientific documentation of the products’ environmental performance. Many U.S. structural wood products have LCA-based “eco-labels” developed under the ISO standard 14025. In this study, the standard dictates underlying life-cycle inventory (LCI) data to be used reflect current practices in the industry. Therefore, gate-to-gate manufacturing LCI data for I-joist must be developed to construct updated cradle-to-gate LCAs for southeastern (SE) and for Pacific Northwestern (PNW) regions of the United States. Modeling the production weighted-average primary industry data per 1.0 km of I-joists with an assumed average depth of 30 cm through LCI analysis provides cumulative energy consumption and environmental outputs. For PNW and SE, cumulative mass allocated energy consumption associated with manufacturing 1.0 km of I-joist was found to be 65.7 and 71.0 GJ/km, respectively, with about 30% of the primary energy provided from wood residues. Emission data produced through modeling found that estimated biomass and fossil CO2 emissions in kg/km were, respectively, 1,774 and 1,969 for the PNW and 1,808 and 2,042 for the SE. One km (4,437 oven-dry kg wood portion, on average) of I-joist stores about 8,130 kg CO2 equivalents. The amount of carbon stored in I-joists thus exceeds total CO2 emissions during manufacturing by about 215%. From this study, the gate-to-gate I-joist manufacturing LCI data can now be incorporated into the cradle-to-gate LCAs to develop an updated EPD.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Bergman, Richard D. 2015. Life-Cycle Inventory Analysis of I-joist Production in the United States. In: Proceedings of the 58th International Convention of Society of Wood Science and Technology June 7-12, 2015 - Grand Teton National Park, Jackson, Wyoming, USA pp. 167-175.

    Keywords

    environmental product declaration, life-cycle inventory, I-joists, life-cycle analysis, LCA, wood, structural composite lumber

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/48944