Seismic Retrofitting is the modification of existing buildings to make them more resistant to seismic activity and earthquakes
The Long Beach earthquake of 1933 alerted Californians of the need to engineer earthquake safe buildings and reinforce existing buildings with seismic retrofitting.
Homes built before 1933 in Los Angeles were built without being bolted to their foundations. Houses built between 1933 and 1940 may or may not have bolting as this is when bolting was starting to become common building practice.
One of the reasons the San Fransico Earthquake of 1906 was so devastating was because it left an estimated 300,000 bay area residents homeless after the quake. With no place to live, and no access to food and water, these earthquake victims had to rely on temporary housing shelters and emergency aid.
Homes with seismic retrofitting are much more likely to stay on their foundation during a major earthquake and therefore remain habitable after an earthquake. Houses that are shaken off their foundations from the lateral and vertical forces during an earthquake may collapse, or be a safety hazard to enter because they are no longer structurally sound.
Seismic retrofitting costs approx $5,000 to $10,000.
attaches the mudsill of the houses framing to the concrete foundation. The strength of the fastening is affected by the type of washer, the size and the type of bolt, as well as the location and spacing of the bolt on the mudsill.
Plywood paneling that prevents cripple walls from collapsing.
Homes with low-clearance where traditional bolting may not be possible can be bolted with a special hardware known as foundation anchors.