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A Look into Wood-to-Wood Connections

Traditional Joinery Meets Technological Innovation on Heartwood

As one of the first completed Type IV-C tall mass timber buildings in the U.S., the 8-story Heartwood project in Seattle, WA, ushers in a new era of timber housing. In this video, you’ll hear from project team members about the design, fabrication, and construction process of a 2-hour rated all wood beam-column-panel connection.


  • Adam Jongeward, PE SE, Structural Engineer, DCI Engineers
  • Taylor Cabot, Project Manager
  • Lauren Magasko, Digital Construction Engineer, with Timberlab

Other Heartwood Team Members:

Susan Jones, atelierjones

William Silva, Swinerton Builders 

Jason McLin, Community Roots Housing

Carl Baldassarra, Wiss, Janney, Elstner Associates

A-P Hurd, Skipstone Development

CLT provided by: Kalesnikoff and Freres 

Heartwood on WIN:

View Heartwood on WIN