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Lessons / Footings, frost and posts
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Footings below the frost line
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A 24 in deep footing that frost lifts, post and all, over one winter.
Every number here is a working estimate. Check it with your building authority.Turn JavaScript on to work the lesson. The drawing shows how it starts.
The rule this lesson teaches
Footings go below frost, typically at least 1.2 m (47 3/16 in) in Edmonton, and onto undisturbed soil.