Design Feasibility: More living units achieved with mass timber framing system

DCI Engineers joined an integrated project team to determine the feasibility of a 114-unit mass timber workforce housing solution. The team compiled a package for eight stories of Type IVC based on speed of construction, efficient post and beam layout, and yielding extra units compared to alternate framing systems.

The building has underground utilities which are coordinated with the traditional concrete spread footings for the foundation system. The lateral system will be composed of a steel buckling restrained brace frame. The gravity system will be composed of glulam beams supported by glulam posts. The glulam beams will support mass timber floor panels.

DCI’s civil team prepared demolition, temporary erosion & sedimentation control, horizontal control, drainage and wastewater control, storm drain pipe schedule, bioretention details, grading, utility, and street improvement plans for the project.

Location Pin Icon
Seattle, Washington
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Square Feet:
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Structural, Civil
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Mass Timber, Multi-Family Residential
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Primary Material:
Steel, Wood

Project Highlights

  • The initial feasibility study required DCI to discuss different unit layouts and the implications of unit dimensions with the architect and contractor team. The team had to coordinate the acoustical considerations of the glulam post and beam frame between the units, as well as how to facilitate a visual timber aesthetic while still hitting the client’s acoustical goal.
  • The initial study was part of a United States Department of Agriculture Wood Innovation grant.

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