About Napa Brace + Bolt
Napa Earthquake Brace + Bolt (Napa EBB) was developed to help homeowners lessen the potential for damage to their houses during an earthquake. A residential seismic retrofit strengthens an existing house, making it more resistant to earthquake activity such as ground shaking and soil failure. The seismic retrofitting involves bolting the house to its
Owners of houses in program ZIP Codes with house characteristics suitable for this type of retrofit in accordance with California Existing Building Code Appendix Chapter A3
Most homeowners decide to hire a contractor to do the retrofit work instead of doing it themselves. A typical retrofit may cost between $3,000 and $7,000 depending on the location and size of the house, contractor fees, and the amount of materials and work involved. If the homeowner is an experienced do-it-yourselfer, a retrofit can come in under $3,000.
Surrounding the crawl space under the ﬁrst ﬂoor, many houses have a short wood framed wall (“
- Bolting: This work involves adding anchor bolts in the
crawl spaceto improve the connection between the wood framing of a building and its concrete foundation.
- Bracing: Adding plywood to the
cripple wallsto help keep the house from toppling off of the foundation during an earthquake.