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Foundations here just need to go below the freeze line to prevent a condition called heave whereby the ground expands via water contained when frozen. The material used has to support the structure above and have enough footprint to spread that load to the ground it sits on. If you can get the compressive strength high enough plastic would substitute for cement.
Oddly: in places of permafrost, you have to go deep enough so the ground doesn't thaw.
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