Two Protective Phases In House Bolting

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Homes in California built prior to 1950 were not instructed to have house bolting during construction. Home retrofitting simply means two protective phases in securing a house against shifting within a quake. The first part, that's necessary, is to have retro bolts mounted between the frame sill plate and the foundation of the house. The second part is placing plywood from the lower uncovered walls in two story homes. Such are called "shear walls." It adds reinforcement against swaying during an earthquake. If you have an older home and don't really know if it's retrofitted, you will need to go under the crawl space of the home and check out bolts every 16 inches along the sill plate. If they aren't present, they can be installed by you or a contractor.