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Deck LedgersImproper sizing and fastening of the ledger board is the single biggest cause of deck failures. The details show methods for fastening the ledger to the band joist directly or through sheathing, with either lag screws or bolts. Also shown are flashing and spacing details that promote drainage and protect the structural members and fasteners from moisture.In the best case, the ledger is through-bolted to a band joist, and the band joist is laterally braced to other components in the floor frame of the primary structure (see Bracing). When this isn’t feasible, other methods are available (see Ledger Support...

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