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Porch corner sinking?

2K views 6 replies 3 participants last post by  Nealtw 
Did 12" get below the frost level where you are?
Was top soil left under that footing.
Are you in an area that has a problem with clay?
 
I'm in central Texas--no frost level here.

They dug it by hand then put in base before pouring the concrete.

Yes, we have clay soil-which is always a problem for foundations here.
I would guess that you have a clay problem where it expands with moisture and shrinks again when dry. I have only seen a couple places here like that but they just keep digging till they get to the bottom. Then they back fill and compact good dirt.
 
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