Remove any loose boards or trim along the deck edge
Clean the ledger area and deck surface thoroughly
Inspect the ledger board, rim joist, and siding for rot or damage
Repair any damaged wood before installing flashing
Measure the length of the deck ledger
Cut the flashing to size
Use corrosion-resistant metal flashing or approved deck flashing tape
Slide the flashing behind the siding if possible
Install flashing over the top of the ledger board
Overlap flashing pieces by the recommended amount
Seal seams and joints with compatible exterior sealant or flashing tape
Fasten flashing with corrosion-resistant nails or screws as required
Keep fasteners placed so they do not create water entry points
Install a drip edge if needed
Reinstall any removed trim or siding components
Check that the flashing directs water away from the ledger
Inspect the finished installation for gaps, bends, or exposed fasteners