I drilled a pilot hole and concrete thickness was barely 4" in the area that the posts needed to go and I wasn't sure what psi my concrete is. I am also using a base plate lift (probably a Direct Lift HR8000) due to 10.5' ceilings. I think that makes it a little more critical on the composition of your slab as well. we are using 1/2" rebar to tie the new footing into the slab. Sounds like you know a little bit more about the composition of your slab....which helps.
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