Originally Posted by Dixiepatriot
18” deep would be a little excessive but on the other hand you’ll probably have to pay a short charge for concrete so might as well pour it thick and a little wider.

Agreed again. Just make sure you put the footings on good native soil or properly compacted fill if any part of existing slab is on fill. Attention to good building practices on a retrofit where you are introducing new loads will serve you well in the long run.


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