Deck-ledger design guidance for what are referred to as “commodity” engineered wood product (EWP) rim boards can be found in both the IRC and DCA 6. But other kinds of EWPs that come in different densities and thicknesses are also used to make rim boards, making a prescriptive approach to ledger design more difficult when there is an I-joist floor system. In fact, given the wide range of engineered-lumber types, thicknesses, and manufacturers, there is no “one-size-fits-all” solution for attaching a deck ledger to an EWP rim board.
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