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ICC, AWC Release Mass Timber Guide

Tuesday, August 11, 2020

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The International Code Council, along with the American Wood Council, have released a joint publication: Mass Timber Buildings and the IBC, which aims to provide an overview of requirements for mass timber construction as found in the 2015, 2018 and 2021 International Building Code.

The document highlights changes beginning with the 2015 International Building Code that allow for construction of mass timber buildings with larger heights and areas than was permitted for buildings of wood construction types (Types III, IV and V) prior to the 2015 IBC.

The document also reviews the 2015 IBC recognition of cross-laminated timber, the reorganization of heavy timber provisions in the 2018 IBC, followed by the changes in the 2021 IBC and International Fire Code for tall mass timber construction.

“The ICC Tall Wood Building Ad Hoc Committee recommendations were based on rigorous fire and life safety equivalent performance and testing. As a result, the ICC membership’s approval of tall mass timber code provisions in the 2021 IBC permit mass timber to be used in lieu of traditional tall building materials,” said AWC Vice President of Codes & Regulations Kenneth Bland. “Given the anticipated demand across the country for taller mass timber buildings, this publication provides the building safety community with comprehensive explanations of the new regulations.”

“We are pleased to be collaborating with AWC on this effort to increase the knowledge of the important code changes established in the 2021 IBC,” said Code Council Executive Vice President Mark Johnson. “Building safety is more important than ever and this publication serves as an excellent resource for code officials to assist with the growing mass timber construction.”

In addition to the updates, the councils plan to co-present two full-day courses on Mass Timber Buildings and the IBC this fall. The course will highlight provisions in the 2015/2018 IBC for Mass Timber Construction, as well as provide an overview of Tall Mass Timber Construction per the 2021 IBC and 2021 IFC.

The guide is available here.

Previous Publications

Earlier this summer, the American Wood Council 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.

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.

That publication can be found here.

   

Tagged categories: American Wood Council (AWC); Asia Pacific; cross-laminated timber; EMEA (Europe, Middle East and Africa); Good Technical Practice; ICC; International Building Code; Latin America; North America; timber; Wood; Z-Continents

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