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CPOx t1_je71orj wrote

Canada means frost heave will be an issue for sure

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frzn_dad t1_je7axyy wrote

False, there are soils that are none frost susceptible (NFS) like dry gravel that don't heave.

In some soils a footing to the frost line isnt sufficient to prevent frost jacking. Where the freezing soil heaving lifts the footer out of the ground with friction along the sides instead of from heaving underneath.

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