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American Wood Council

DES441-1 – Taking Wood to the Next Level - CLT as a Floor or Roof Element

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An overview of 2018 International Building Code (IBC)and 2018 National Design Specification® (NDS®) for Wood Construction provisions related to the use of cross-laminated timber (CLT)will be provided that includes a step-by-step structural and fire design example for a roof and floor application. Additionally, the WoodWorks® Design Office’s Sizer program, version 12 (released January 2019) which enables CLT floor and roof design, will be used to demonstrate the structural design. Innovative wood products such as CLT are leading to a resurgence in heavy timber (Type IV) design and construction. These innovations are also making it possible for wood to be designed and built to taller heights and larger areas than what current codes permit. This has led to code change proposals for the 2021 IBC, expanding Type IV construction for tall “mass timber” buildings. Participants should find this presentation useful for current and future applications utilizing CLT in horizontal assemblies.

Learning Objectives: 

  1. Discuss relevant CLT product manufacturing and design standards and identify where these standards are recognized in the IBC.
  2. Consider the relevant structural design properties of CLT for floor and roof applications.
  3. Discover how to design CLT floors to achieve serviceability goals related to deflection and creep.
  4. Identify applications for using CLT and develop solutions using the highlighted resources.

Equivalencies: 1.5 Hour of Instruction = 0.15 Continuing Education Units (CEU) = 1.5 Professional Development Hours (PDH) = 1.5 Learning Units (LU)


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