REVIEWED BLD Structural Calculations-1RECEIVED
Mar 30 2021
CITY OF EDMONDS
DEVELOPMENTSERVICES
`DEPAWMENT
This document to remain on site for inspection
Structural Calculations
7330 172nd Street S.W.
Edmonds, WA 98026
Snohomish County
Sidesway Project No. 16074.03
Prepared By:
SIDESWAY
ENGINEERING
Bolin Residence November 7, 2018
Project No. 16074.03
Project Description
Sidesway Engineering was retained by the homeowner to perform lateral analysis and design as necessary
to obtain a retroactive building permit for exterior wall modifications at the existing single family residence
located at 7330 172nd Street S.W. in Edmonds. It is our understanding that three full height shear wall
segments along the south and west side of the main floor were removed by the previous homeowner
without a permit. The remaining structure is to be evaluated as is, and if necessary, be upgraded to meet
current code requirements. No lateral force resisting system modifications were made at the basement
level which does have full height concrete basement walls on three of the four sides.
The existing home is conventionally framed with wood atop continuous interior and exterior concrete
footings or basement walls. The lateral force resisting system consists of sheathed roof and floor
diaphragms spanning to the exterior wood stud shear walls. The original house plans were available for
our use, and existing house framing and dimensions were obtained from these documents and confirmed
by a site visit to the house.
Scope of Work
Provide lateral calculations for the modified wall configuration as required to obtain a building permit.
Provide structural sketches detailing framing requirements of necessary upgrades as needed for permit.
Design Criteria
2015 International Building Code (IBC)
2015 International Existing Building Code (IEBC)
ASCE 7-10 Minimum Design Loads for Buildings and Other Structures
Applicable Material Reference Standards (ACI, MSJC, AISC, NDS)
This is a Risk Category II structure designed for the following loads:
Dead Loads: 19psf (roof/ceiling), 13psf (floor), 9psf (walls)
Snow Load: 25psf
Wind Load: 110mph, Exposure B, KZT = 1.37 (refer to wind loads)
Seismic Load: R = 6.5 (wood s.w.), Site Class D, SDC D (refer to seismic loads)
Project Summary
We have determined that the removal of the wall pier on the west side of the house is structurally
acceptable. The remaining shear wall length and nailing on the west side of the house is adequate as it
exists. The uplift forces on the remaining three wall piers is negligible at the main floor and at the
basement level and no upgrades are required for this wall line.
Two wall piers were removed on the south side of the house. The remaining full height wall segment was
determined to be insufficient as it exists, and will require additional anchorage, holdowns, and tighter nail
spacing in the plywood. These requirements are shown in the attached framing plan and shear wall
schedule. Additionally, the top plate of the wall requires additional nailing or straps to assure the load is
collected along the length of the house and delivered to the shear wall. This work can be accomplished
within the attic space.
Once the upgrades on the south wall as described above are installed, the lateral system of the existing
single family residence will conform to the provisions within the 2015 IBC and IEBC. Refer to the
structural sketches and the calculations for structural framing requirements.
Disclaimer
This calculation package is based on the documentation that was available to us. Sidesway Engineering
did not perform a complete as -built to verify the accuracy of the provided data and we should be
contacted if there are any discrepancies with the assumptions contained within these calculations. We
assume the structure has no known deterioration or damage that would adversely affect capacity.
20305 87th Ave. W.
S98026 I DE WAY Edmo(425 673-41160
rNG I N F FRING