I have a situation where I am wanting to rebuild a porch on an existing old stone home with concrete foundation basement. I am getting different recommendations from various builders. THe concrete foundation has a little variance ( a few small “Humps”) and the irregularity of the stone protrudes proud of the concrete basement below it. One idea was to attach 1 foot long PT 4x4" vertically, spaced every 16’ - 24" along the run using appropriate fastener for the concrete and then attaching a 2 x 10" ledger board to the 4x4s. Then the 2x 8 joists would sit on top of the board using stainless simpson hurricane ties. The joist span is 7 feet. I have never heard of a ledger being spaced away from the building with 4 x 4s. I like the concept for the problems it solves but I am uncertain whether it is proper. Any help in this matter would be greatly appreciated.