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AWC Releases Fire-Resistance Update

Tuesday, June 9, 2020

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The American Wood Council recently released an updated “Technical Report 10 (TR10), Calculating the Fire Resistance of Wood Members and Assemblies."

The revised 2020 guidelines are in accordance with the 2018 National Design Specification for Wood Construction.

“The emergence of mass timber as a competitive product in the construction marketplace has increased designers’ interest in the fire performance of mass timber,” said AWC Vice President of Engineering Brad Douglas.

“Recognizing that increased interest, the principal changes to this edition provide new examples and background on mass timber members and assemblies. TR10 will assist in the design of efficient and building-code-compliant load-bearing wood members and assemblies by providing background information, examples of calculations, and end-use tables for a variety of structural wood products.”

Three primary revisions were included in the TR10, which are:

  • The expansion of design provisions for calculating the contribution of gypsum board protection in Chapter 4, “Design Procedures for Exposed and Protected Wood Members.” The revised provisions provide information for calculating both the increased structural fire resistance and thermal resistance provided by various types of protection.
  • The alculation of thermal separation times were updated in Example 5 (Exposed Cross-Laminated Timber floor design) and Example 6 (Exposed Cross-Laminated Timber wall design) to more closely estimate the benefits of protection.
  • Example 8 (Protection of Steel Ledger Connection) and Example 9 (Protection of Beam-Column Connection) were also updated to include information on use of gypsum board as required to protect connections of mass timber members in the new Type IV-A and IV-B buildings permitted in the 2021 International Building Code; and a new Example 10 (Protection of Tension Splice Connection) was added at the request of designers seeking an example of a completely concealed mass timber connection.

The publication can be found here.

   

Tagged categories: American Wood Council (AWC); Associations; Fireproofing; Good Technical Practice; NA; North America; Regulations; timber

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