The Problem, Pier and Post foundations are similar to cripple walls, in this type of construction, the outside wall of the house is supported by wood post resting on unconnected concrete piers. siding is often nailed to the outside of the posts. If the posts are not braced against swaying, they may fall during an earthquake. How to identify it, From underneath the house, if you do not see a continuous foundation under the outside walls of the house, and you can only see unc