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If you mean how wide a footer you need, only as thick as the old existing footer. Residential footers are usually way over designed, so there is no reason to make it wider. If you do mean thick, a normal house footer is 8" thick. If you are actually underpinning an existing footer, the dinensions are in front of you as you excavate under it for underpinning.??? Don't make it anymore complicated than that.

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16y ago

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