A cripple wall is a short stud wall that extends from the top of the perimeter foundation upward to carry the floor joists. The danger comes from the fact that these components are in the seismic load path and are often inadequately braced. They can hinge over, collapse like dominos, & slide in a large earthquake. Take care; not all homes have cripple walls, but that won't stop some contractors from offering bracing for them

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