Residential · IRC 2021 §R403.1.4 / §R403.1.4.1
Footing Depth Below Frost Line
Footing section with the 12 in minimum below undisturbed ground drawn to scale, the frost line set by Table R301.2, the four frost protection methods and the accessory structure exceptions.. Referenced to IRC 2021 §R403.1.4 / §R403.1.4.1.
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