That's true however all of the columns and posts are in the ground between 5 to 8 feet with truck rims welded to the bottoms.
I've had to design structures around swamp muck saltwater infusion from Oceans as far as 30 miles inland, seasonal soil heaving due to high annual rain fall and long dry spells on gumbo clays, Shifting dunes, fluid rock, and bed rock,and annual frost heaving, but never actual permafrost.
I placed the large diameter rims under the columns to serve as footings and wanted them deep enough to not be effected by any movement of the sandy loam soil above in most cases I was able to excavate through the layer of red clay into a harder bluish white layer below.

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