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Our basement is down in sand and gravel. Doesn't shift when it freezes. From what I was told , if you are in a clay type soil in sub zero temps the frost will freeze the clay mixture and it will shift causing problems with your foundation which causes the house to shift , drywall cracks ect. I have no first hand knowledge of this just what I have been told. If it was me I would ask contractors in your area. Just as a yardstick when we left last year it was minus 14F with very little snow cover. Typically we average 300 inches per year. So if there is little snow the frost can pound down 5 ft or so. That's why our water lines are down 7 ft.
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