decks.com. how to build a deck - attaching the ledger board
(a free-standing deck, of course, does not have a ledger.) the ledger is ... if your house was built since the mid 1990s, there is a chance that the floor system is constructed with a mwj (manufactured wood joist) floor system. in these cases ... after properly installing the flashing, install the siding above the ledger as needed.