Frost-Protected Shallow Foundations

Posted on Nov 28 by Martin Holladay


Frost-protected shallow foundations consist of a monolithic thicken-edge slab wrapped with vertical and horizontal rigid-foam insulation

The footings of most foundations are placed below the frost depth. In colder areas of the United States, this can mean excavating and pouring concrete 4 ft. or more below grade. If you include enough rigid-foam insulation around a foundation, however, you can keep the soil under the house warm enough to permit shallow excavations, which can be 12 in. or 16 in. deep, even in northern areas.

[To read more of Martin Holladay's article from the December 2010/January 2011 issue of Fine Hombuilding, click the link below.]

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