Is this good enough for support??

[Myka]

Originally Posted by AquaticFinatic

So I should just build another wall instead of the posts? From what I can find out the floor is at least 4" thick plus. I know I should have run joists and maybe tripled up but to much wiring and plumbing in the way for that.

That is typical slab thickness. The best thing you could do would be to jackhammer that slab out where you want the jack posts and pour a footing under it then hide the jack posts in a wall or something. I imagine you're not keen on that though. The length of a wall spreads the point load of the jack posts provided your bottom plate in the wall is at least doubled to help spread the weight instead of just bending. If you were really concerned, you could build a lintel (like over a window) made with a couple 2x10s to lay on the floor to spread the weight. That won't bend.