Step 1 · Attach Stringers to Deck Frame

Position the top of each stair stringer flush against the deck ledger board. Ensure the stringers are plumb and parallel to each other. Secure the stringers to the ledger board using lag screws or structural screws specifically designed for exterior wood construction. Drive the screws through the stringer and into the ledger board, ensuring at least two screws per stringer. For added support, if the stringer extends past the rim joist, secure the bottom of the stringer to the deck frame joist using appropriate fasteners, such as joist hangers or structural screws, following manufacturer recommendations for load-bearing connections.