That’s just wrong. I’ve seen many flashings installed the same exact way and it does nothing to protect the ledger board. I always red flag this type of install at the ledger board because moisture has a tendency to rot the ledger board which defeats the purpose of installing the flashing period, if it’s installed behind the ledger.
It must tuck under the siding and then out and over the top of the ledger board. Being installed over the ledger will keep all moisture away from the house attachment to prevent rot. A rotted ledger will bring bad news.
Here’s a good graphic of what should be done. Just used it in a litgation case where, after only 8 months, an $800,000 house had severe rot in one wall facing horizontal rains off the North Atlantic ocean !!!
What about attaching a deck structure to a home with brick veneer exterior walls? A free-standing deck structure is typically recommended for this type of wall construction. Also, with the newer treated lumber, standard metal flashing cannot be placed due to the copper treatment of the decking material. I believe a rubber membrane flashing is now available to be used as flashing for treated lumber ledgers.
It would be kinda hard to miss that flashing. BTW the builder never contacted me. He told the buyer, “Well we had some problems with da subs on dat one, I’m gonna fix it.” That was it, no problems. I wanted to speak with him, he never called.