Column Footings

How deep does a basement support column need for a concrete footing below the basement concrete floor?

12 inches.

That’s what I thought. Thanks!

The footing does not need to be below slab in basement.

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…but, on undisturbed soil.

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A basement can be fully or partly below grade. In a basement a support column footing can reside on undisturbed soil. No depth required but size is important. Soil bearing capacity relate to the size of footings.

CONCRETE FOOTING SIZE CHART WITH STANDARD WIDTHS

Hope that helps.

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