For aesthetic reasons, I would like to use 12"x16" piers for a porch, and that means no Sono tubes or 6x6 posts. The top of the piers are only going to be 19" above grade with 42" below grade. NOTE: Someone else has already dug out the old block footings that were set too shallow, so there is no hope of making nice new holes to help act as part of the form. I know I could use block, but my business is carpentry and I’ve never laid block before. Yeah, I could learn, but this is only for three piers and there isn’t enough money in the budget for me to hire a mason. Also, I thought pouring concrete would be the quickest and easiest way to go when it comes to getting the exact height and positioning that I want.
So my question is this: How should a form be framed for a 5’ pier?
3/4" plywood and what type of exterior framing?
2x4s or 2x6s? How should they be set and on what schedule?
I’m looking for advise from someone who has build forms in the past.
Thank you in advance.