III. Structural Problems and Strengthening Methods A. No Foundation or Wood Foundation

In some older buildings, there maybe no foundation at all. During an earthquake, the entire structure can slide around on the topsoil and be heavily damaged. When there is no foundation, one must be constructed to connect the structure to the ground. The existing building must be temporarily supported by "shoring" while a new foundation is constructed. This involves hiring a house mover or contractor to lift and support the structure while the ground is trenched and forms for the perimeter foundation are built. Then the reinforced concrete foundation is poured and the existing structure is lowered and bolted onto the new foundation.

Typical Cost: $12/sf (square foot) for temporary support

of one-story house

Typical Cost: $60/lf (linear foot) of foundation reconstruction

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