House siding or the exterior finish system must be removed prior to the installation of the ledger board. Approved corrosion resistant flashing is REQUIRED at all ledger board connections to a wall of wood framed construction.Use a continuous flashing with a drip edge like Everflashing’s deck ledger flashing. The threshold shall be carefully flashed and caulked to prevent water intrusion due to splashing from the deck and roof or melting snow. We recommend using Stainless Steel Everflashing to flash your ledger board. Once Everflashing is installed, you do not have to remove the siding to resurface the deck.
Go to http://www.ledgerflashing.info. for more details. We also have http://www.everflashing.org. for contact information. http://www.ledgerflashing.com. main website for photos of correct ledger flashing installation.