Originally Posted by Rusty

The way I would do it. 13ft ceiling. 6", 5000 psi, fiber reinforced, rebarred concrete floor. For where the posts would sit. That area would be a 2ft square, 2ft deep, with 2 layers of rebar. The posts would be anchored with L bolts in the concrete. The L bolts would be 20" long. Having 2" sticking out to mount the posts to. The 2ft squares would be poured first. Let them set-up. Then pour the rest of the floor. The 2ft squares and floor would be the same level.