Greetings, I'm replacing a deck, it's a rather straight-forward job except for one thing - the existing deck did not have a ledger board attached to the house band board, there were simply joist hangers attached directly to the band board. The band board was end-nailed to the inside floor joists and toe nailed to the sill plate - it's quite solid. I don't see reason to add a ledger where there was none before but I can't find any examples of this kind of deck attachment. Is it acceptable construction? If so, what nails should be used to attach the hangers to the band board that's only 1 1/2" thick with nothing behind it? 1 1/2 ? 3 ?