The porch I'm building is 20' x 15' with the 20' side running along the house and the 15' coming out. I have a ledger board connection with 6 footings around the perimeter of the porch. 5 of the footings will be filled with a concrete footing 10" thick with a 12" diameter pier on top to bring it above grade. The 6th footing is right along the side of a bump out and I have dug to the house footing and plan to place my post directly on the lip of the footing. The county inspector says this will work fine and I've seen it done this way at other homes in the neighborhood.
My concern is accelerated rot of the post since it will be below grade. I came up with two options but wanted to see other opinions out there.
Place the post on the house footing as planned and surround with compacted gravel with soil around the gravel. This may help any water that comes in the hole to flow down into the french drain directly beneath the post.
Pour concrete directly over the gravel surrounding the french drain and up along side the house foundation wall to bring the concrete pier above grade.
Thanks for the feedback.