Adequate Foundation Depth.

The foundation should be placed below the frost line because of volume changes that occur during freezing and thawing,  and also below a depth where seasonal volume changes occur.  The minimum depth below which seasonal volume changes do not occur is usually 4 feet, but it varies with location.  If foundation soils consist of swelling clays, the depth may be considerably greater, as described in TM 5-818-7.  On sloping ground, the foundation should be placed at a depth such that it will not be affected by erosion.

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