2013 Wood Works Wood Solutions Fair

Long Beach, California –Feb 26



 Ronald F. “Rawn” Nelson

Structural Engineer, Hermosa Beach, CA


The design of wood structures is constantly challenged with a wide variety of issues that affect the overall success of the final design and function.  Wood Truss Wall Assemblies (WTWAs) have successfully been used in single and multi family residential, institutional, industrial and commercial wood structures.  Benefits have been obtained in single story mezzanines to five story plus lofts residential structures.

Benefits in using WTWAs include:

  • Quality controlled plant built shear wall systems for a stronger and more reliable building
  • Speeds the entire schedule
  • Labor and material savings 5-50%
  • Ease of installation
  • More flexibility for larger openings
  • No need for costly special inspection
  • Reduces job site waste
  • Opportunity for LEED and Green Points
  • Less storage on job site
  • Predrilled for electric wiring
  • Continuous tie-down hardware pre-installed in wall
  • No plywood or nailing problems at shear walls
  • Reduces potential for mold or wood rot at base
  • Stamped and signed calculations, layout plans and details
  • ICC-ES and City of Los Angeles approvals
  • DSA compliant
  • Aspect ratios up to 6:1

There are many design/detailing issues to be considered by a designer for lateral force resistance in a building.  This presentation/paper will discuss these issues and show design examples.

Learning Objectives

  • Participants will learn how Lateral Force Resisting Wood Truss Wall Assemblies (WTWAs) can accelerate the construction schedule by both reducing the potential of job site delays and labor time required to assemble job site components
  • Participants will be provided with design examples and detail issues related to the use of WTWAs in several types of structures
  • Participants will be provided with information on how other trades have interacted with WTWAs on existing projects
  • Participants will be provided with independent third party verification of benefits received from using WTWAs on existing built projects