I'm a DIYer planning to put in a deck, and am working on a permit application. I've got what I think is an unusual configuration of siding and sheathing on my house, and I'm wondering what the best method would be for attaching a deck ledger board. The sheathing is spaced away from the wall studs by 1.5 inches (sheathing is attached to 2x4s on their sides). The siding and house wrap will be replaced at the same time as the decks, so I'll be able to cut back the sheathing to access the rim joists and sill.
Two possibilities I've considered are are:
Attach a board to the rim joist that's the same size as my ledger board, sheath over that to make for a flat exterior surface, and then attach the deck ledger to the sheathing, fastening through to the rim joists with long bolts. I'm not sure if this configuration would provide adequate support. It would be possible to attach a board to the sill to provide additional support for the spacer board above if that helps (the sill is a beefy 6x8).
Attach the ledger directly to the rim joist so that the ledger is inset behind the spaced-out sheathing. The challenge with this approach is how to properly flash this configuration.