I'm going to be pouring some footings using sonotubes. They will be about 24" deep 12" in diameter. The bottom of the hole will be 18"d, I'll pour about 4" then set the sonotube in then fill it up. The footings will support a small mud room on the back of a small cabin.
My questions are, do I need rebar, how many pieces and should the have an ell at the bottom to protrude into the wider portion? At the top I will sink in simpson column bases.