Seismic Retrofitting Bolted Homes

From https://bayarearetrofit.com. Homes with existing foundation bolts can double their earthquake resistance by installing only half the retrofit components you would need in a full retrofit. This kind of retrofit is only worth doing if you are doing the retrofit yourself. For a seismic retrofit contractor it will take a day to do it like this, and it will also take a day to do the entire house. It will more or less cost the same either way, so it only makes sense if you are doing the work yourself. An unskilled person will take about four days to do a complete retrofit, so saving thousands on the labor and material pays off.