Jimjxs263:
I don’t know of any code details you can point to; and that certainly seems like kind of a crappy way to leave the raw edge of EFIS panels exposed in thin air, they’ll wick water up. The codes do usually say... “and properly flashed...” when discussing these kinds of details though. Good builders used to have some concept of good details. That seems to have been lost in the rush to write prescriptive codes so that anyone can do it, if only they can follow the cookbook and its convoluted verbiage. In my world, there should be two levels of flashing there, and a water barrier behind the EFIS and ledger.
The pocket that the ledger fits in should be flashed behind the ledger and up behind the water barrier membrane. This flashing should have full height dams at the ends of the ledger to direct any water that does get behind the ledger out of the wall, not down into it at the ends. This flashing should come out over the siding mat’l. below the ledger and terminate with a drip edge. The second flashing is over the top of the ledger, goes up behind the water barrier, and terminates in a drip edge out beyond the ledger face. It should have dams at its ends too, bent up flashing mat’l., but if nothing else, at least a deep bead of caulking to form a dam. For all the trouble with PT lumber and any metal flashing mat’ls. these days, I’ve taken to using a heavy grade of peal-n-stick membrane for these flashings. When the decking runs parallel to the ledger I actually rip some small PT wedges a little less than the width of a deck board, tack and caulk them to the top of the joists, then bring the top flashing down over them. And, now the first deck board slopes to drain too.
