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Lessons / Footings, frost and posts
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Bear on undisturbed soil
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A footing on basement backfill that sinks on the house side within three years.
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
A footing has to reach soil never dug before, past the backfill around the basement.