Earthquake Retrofitting entails that a property with a raised foundation is properly secured with metal attachments so that in the case of seismic activity the foundation is secure. Earthquake retrofitting includes metals attached to the Pier/Post system; URFP-10’s are attached to the footings, and cripple wall bracing.
When the raised foundation is built it has cripple wall that rest on top of the mudsill. Cripple wall bracing which is plywood sheathing with ventilation holes is not always installed. In the case of seismic activity the house may fall down with out the cripple wall bracing. At the earlier signs of damage do to the lack of cripple wall bracing you will notice the house start to pinch or buckle on the bottom perimeter of the property.