Structural Engineering Design for Coastal Residential, Coos Bay, OR
S3DA Design is providing structural engineering services for a new two-story single-family residence at 89181 Lighthouse Way in Coos Bay, Oregon. The project includes demolition of the existing home and reconstruction within the same footprint on a coastal site governed by high-wind and seismic design requirements.
S3DA’s Scope
- Structural loading analysis for wind, seismic, snow, dead, and live loads per ASCE 7-16 and 2021 ORSC.
- Design calculations for foundations, shear walls, load-bearing walls, posts, headers, floor framing, roof framing, hold-downs, and connectors.
- Coordination of the client-designed glulam beam system at the central portion of the home.
- Review of glulam reactions and connection compatibility with the surrounding gravity and lateral load paths.
- Foundation plan based on continuous concrete strip footings.
- 1st floor, 2nd floor, and roof framing plans.
- 1st and 2nd floor shear wall layout plans.
- Longitudinal and cross-section structural building sections.
- Typical structural details, notes, and specifications.
Key Challenges & Solutions
The coastal location requires careful structural design for Wind Exposure D, 135 MPH ultimate wind speed, and Seismic Design Category D. S3DA’s structural team will coordinate the hybrid framing approach—client-designed glulam beams combined with conventional wood framing and prefabricated parallel chord trusses—to maintain a clear, code-compliant load path from roof to foundation.
The Result
S3DA will deliver permit-ready structural calculations and drawings that support a safe, durable, and code-compliant coastal residence while respecting the client’s preferred glulam framing concept and the existing building footprint.
