Residence Addition and Remodel

Project Details

This project involves a comprehensive structural modification and expansion of an existing single-family residence in Los Banos, California. The scope encompasses the structural design of new roof framing, shearwalls, columns, beams, and headers, along with a foundational system designed to support a 442.50 sq. ft. addition and a 247.50 sq. ft. storage area. These new spaces accommodate a kitchen, pantry, bedroom, and bathroom.

The engineering process utilized modern wood framing solutions, primarily employing Douglas Fir Larch lumber (grades No. 1 and No. 2) and structural plywood sheathing. The foundation system was enhanced with new pad footings, wall footings, and a 4-inch thick concrete slab-on-grade to ensure compatibility with both new and existing loads.

The structural elements were engineered in strict accordance with the 2022 California Building Code (CBC), the 2022 California Residential Code (CRC), and ASCE 7-16 seismic provisions. Given the site’s classification under Seismic Design Category D, the analysis utilized the Equivalent Lateral Force Method to ensure safety and stability under high seismic demands. Additionally, the design factored in wind speeds of 93 MPH, focusing on robust lateral load resistance and precision connection detailing through the use of specialized Simpson Strong-Tie components.

Role

Structural Engineer/Designer

Services Provided

The scope of services includes the preparation of structural calculations and structural drawings for the proposed single-story addition. Structural calculations shall include loading analyses for wind, seismic, snow (if applicable), dead, and live loads, as well as the structural analysis and design of new foundations, shear walls, load-bearing walls, headers and collectors, posts, roof rafters or trusses, holdowns, anchors, and connectors. Tie-in checks will be performed at diaphragm, chord/collector, and gravity load paths where the addition connects to the existing residence. Structural drawings shall include a foundation plan, roof framing plan, first-floor shear wall layout plan, longitudinal and cross-sectional building sections, and typical structural details, notes, and specifications necessary for construction and permitting. As this is a single-story addition without a crawlspace, a separate floor framing plan is not included.