Wisconsin · answered by Verika · verified against sources
What is the frost depth requirement for foundations in Wisconsin?
Footings and foundations in Wisconsin must be placed below the frost penetration level or at least 48 inches below adjacent grade, whichever is deeper [1]. Exceptions include frost-protected shallow foundations (ASCE 32), footings on bedrock meeting specific conditions, and floating slabs in unheated single-story buildings under 12,000 sq ft [1,2].
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