@rowingengineer
Soil conditions: nothing special, hilly area but the building pad is pretty flat; visible rock outcroppings around the flat area; no soil report required or provided.
{now quoting from the blueprint notes:}
Existing perimeter footing, with 2x6 mudsill and 4x6 rim joist on...
And sorry to be so fragmented: here is the SE design basis on seismic load
Seismic importance factor, I = 1.0
Mapped spectral response accellerations, Ss=2.37 and S1=1.23
Spectral response coefficients, Sds = 1.58 and Sd1=1.23
Seismic design category, SDC=E
Response modification factor, R=6.5...
Sorry for not providing enough info. Let me make amends...
We are in Northern California, and yes, there is some rattling here. The home is from 1959 and has stood up to past quakes. The structure must comply to California Building Code (CBC); there are no special conditions at play.
The house...
We are doing a remodel on a 1-story home, wood framed with exposed 16' long ceiling beams 6' o.c., with perimeter wall providing a 24" crawlspace.
A 5'6" interior wall, located in the middle of the span under one such ceiling beam, needs be sheared up (there is no other shear wall in same...
