Frost Depth Calculator

Determine foundation frost depth requirements by location and soil type per IRC R403.1.4

Input Parameters

Results

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Frost Depth
in
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Min Footing Depth
in
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Footing Bottom
ft below grade

Reference

IRC R403.1.4: Footings must extend below frost line Typical depths: 12" (FL) to 72" (MN/AK) Silt soils: increase depth due to frost heave