Proposed Residential Addition

Project Details

This project involved the structural analysis and design for a proposed residential addition. The comprehensive scope included engineering solutions for a complete structural assembly, featuring roof rafters, ridge beams, ceiling joists, columns, and headers. The primary framing utilized Douglas Fir-Larch No. 1 and No. 2 lumber, integrated with high-performance 24F-V4 Douglas Fir Glulam beams for major structural supports. The design process involved a detailed structural analysis to ensure the addition could safely withstand environmental loads in accordance with the International Building Code (IBC 2021), California Building Code (CBC 2022), and ASCE 7-16 standards. Lateral load resistance was engineered through the implementation of a wood shearwall system utilizing Structural I plywood sheathing and high-capacity Simpson Strong-Tie hold-down devices. The structure was designed to remain stable against design wind speeds of 96 MPH and met the requirements for Seismic Design Category D. The foundation system featured a new 4-inch thick reinforced concrete slab-on-grade supported by designed continuous wall footings and individual pad footings, all engineered for a soil bearing capacity of 1,500 psf.

Role

Structural Engineer/Designer

Services Provided

The scope of services included the preparation of structural calculations and structural drawings for the proposed 250 SF addition and interior modification works. Structural calculations included loading analyses for dead, live, roof, and seismic loads in accordance with the 2022 CBC and ASCE 7-16 requirements. The work involved the structural analysis and design of the new addition framing, including foundations, walls, roof members, anchorage, and connection details. Services also included the structural analysis and design of the new drop beam required to support the removed wall between the kitchen and living space to ensure adequate load transfer and structural stability. Structural drawings were prepared to illustrate the foundation plan, floor and framing plan for the addition and beam installation area, roof framing plan, and structural details for the new drop beam and wall removal. General structural notes, details, and specifications were also included to support permitting, coordination, and construction implementation.