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
    Author(s): Samuel L. ZelinkaLaura E. HasburghKeith J. Bourne
    Date: 2020
    Source: Wood & Fire Safety, 2020. 232-237.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (767.0 KB)


    Cross laminated timber (CLT) is becoming more widely available in North America. However, it has not yet achieved widespread use in construction in the United States because provisions for CLT have only recently been added to model building codes. For example, CLT was recognized for the first time in the 2015 International Building Code (IBC), and the 2021 IBC will allow wood buildings made of CLT and other types of mass timber to be constructed up to 18 stories high. The changes to the 2021 IBC were implemented after several years of work from an ICC Ad-Hoc committee on tall wood buildings including fire testing supervised by the US Forest Service, Forest Products Laboratory. The fire tests involved five compartment fire test scenarios on a two-story building and specifically examined occupant egress and firefighter safety in corridors near the compartments. In addition to the fire tests performed by the Forest Products Laboratory, more large-scale fire tests were performed for the revision of the PRG-320 standard; the product standard for CLT in North America. These tests examined the heat resistance of adhesives used in CLT. This paper highlights the important changes to the IBC and the PRG-320 standard as well as summarizes the tests used to validate these changes.

    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.


    Zelinka, Samuel L.; Hasburgh, Laura E.; Bourne, Keith J. 2020. Overview of North American CLT fire testing and code adoption. Wood & Fire Safety, 2020. 232-237.


    Google Scholar


    Cross laminated timber (CLT), fire resistance, compartment fire testing, standardization

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page