| CG Engineering provided the civil and structural design for this building addition and renovation project. The existing structure was a 12,000 square foot single-story CMU building with heavy wooden roof trusses spanning from wall-to-wall. Additions were designed and constructed on the north and south sides of the existing building. The south addition added 3,300 square feet of manufacturing space and was a single story consisting of CMU walls, open web steel roof joists, and metal roof decking. The north addition was two stories and consisted of 3,000 square feet of office space framed with open web steel joists, steel beams and columns, metal decking, and CMU walls at the exterior. Part of the north addition also had a clear story area which housed a small concrete batch plant. Ramps and retaining walls were designed to facilitate vehicle access to the batch plant.
Because of the age of the existing building, the additions were designed to carry all of the lateral loads from the existing structure as well as the new additions. This was accomplished using drag struts and steel connection to tie the structures together. Additionally, several of the walls of the existing structure were upgraded to new CMU walls. All new foundations were conventional footings with slab-on-grade.
The civil engineering included plans and calculations for the 1.48 acre site. The project’s proposal was to add two additions onto an existing building and to replace an existing gravel lot with new pavement. Plans specified and detailed erosion control, grading, drainage, street improvements, water and sewer. The design was completed per the King County Surface Water Design Manual. Storm drainage was routed to underground detention pipes. During construction, the owner requested additional features to the project. CG Engineering provided the design of a ramp, wash bays for vehicles, additional pump systems, and improvements to the street beyond the City of Puyallup’s initial requirements.
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