Hillside Residence Retrofit
A 1960s split-level on a steep Oakland hillside needed to meet current seismic code before a major remodel could proceed. The existing stepped foundation and unbraced cripple walls left the house vulnerable to lateral movement in a major event.
An unbraced house on a moving slope
The home sat on a stepped perimeter foundation with tall, unbraced cripple walls and no positive connection between the framing and the foundation. On a hillside in a high-seismic zone, that combination is the classic soft-story failure path — the house could slide off its foundation in a design-level earthquake.
Continuous load path, foundation to roof
We ran a full lateral analysis against current code, then designed plywood shear walls and steel hold-downs to brace the cripple walls and tie the framing to the foundation.
New foundation bolting and a continuous collector detail give the structure a single, traceable load path from roof diaphragm down to the stepped footings.
Every connection was detailed for the contractor so the retrofit could be built without guesswork or field changes.
Code-compliant, permit-approved, build-ready
The retrofit set passed plan-check on the first submittal and gave the homeowners a structure rated for the site's seismic demand — clearing the way for the remodel above it.
- Plan-check cycles
- 1
- Cripple walls braced
- 100%
- Seismic standard
- Current code
Approved on first submittal.
Full perimeter shear bracing.
Lateral demand met for the site.