Purpose and Installation of Deck Ledger Flashing

Home inspection of deck ledger flashing. Deck ledger flashing prevents water from getting behind the ledger board and damaging the wall sheathing and rim joist.

Ledger flashing extending behind the siding and across the junction of the deck ledger board and wall sheathing.

Retrofitting ledger flashing to an older deck. Deck boards are not yet installed.

In this picture, you will see how the deck ledger flashing is installed to prevent water from accessing the structure.  In the picture, the ledger flashing is in the process of being installed. The flashing covers the junction of the deck ledger board and the exterior wall surface, preventing water from getting behind the ledger board and directing the water away from the structure.

The picture shows ledger flashing being retrofitted to a preexisting deck with stucco siding.  Here the top edge of the flashing will have to be sealed to the stucco face unless the stucco is removed or counter flashing installed.  Again the main point is to see how the flashing prevents water from getting behind the ledger board and is directed to the exposed surface of the ledger board or beyond.