I've got a wraparound porch on the house. It's supported by a half dozen
28" x 30" x 24" concrete piers (plus other sized concrete piers elsewhere) along the front of the house. They're all floating on the ground at the top of a fairly steep slope, pushed back 6-7' or so from the edge. Everything is in good condition. Not seeing any cracks, etc.
However, the ground under the corner pier has eroded because of a bad drainage problem -- poorly directed downspout (fix in progress) -- and the front edge of the block isn't supported anymore. It's starting to settle and causing the post to move. The porch has a bit of a bounce to it now in that corner, but I don't think it's moved any.
The angle is a bit exaggerated in the picture.
(Note: lattice is not attached to post)
I would like to remove the one concrete block and replace it by digging out a proper footing and putting in a longer post. I'm envisioning something along the lines of a 3-4 foot sonotube sitting on a 6" footer (bit of a WAG on that).
The ground is rocky clay and it would be on a bit of a slope.
Is this the right sort of solution or am I just just going to introduce more problems in the long run?