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1809.3 Depth of Footings
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The minimum depth of shallow foundations below the undisturbed ground surface shall be 12 inches (304.8 mm). Where applicable, the depth of shallow foundations shall also conform to Section 1809.3.1.
1809.3.1 Frost Protection
Except where otherwise protected from frost, shallow foundations, pile caps, and other permanent supports of buildings and structures shall be protected from frost by one or more of the following methods:
- Extending a minimum of 4 feet (1220 mm) below the lowest adjacent permanent exposed grade;
- Constructing in accordance with ASCE 32; or
- Erecting on solid rock.
Exception: Free-standing buildings meeting all of the following conditions shall not be required to be frost protected:
- Classified in Structural Occupancy Category I (see Table 1604.5);
- Area of 400 square feet (37.1 m2) or less; and
- Eave height of 10 feet (3048 mm) or less.
1809.3.2 Foundations on Frozen Soil
Shallow foundations shall not bear on frozen soil.
Exception:
Temporary structures may bear on frozen soil if the soil is maintained in a frozen condition throughout the service life of the temporary structures being supported. The method of maintaining the soil in a frozen condition shall be approved by the commissioner.
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