Start by making an outline on the siding where you want to position the ledger board.
Flashing deck to siding.
That should pop the nail head out far enough so you can pry it out.
Gap between the end of the ledger and the ends of siding and fill it with high quality exterior caulk to keep water from leaking behind the ends of the ledger.
Amerimax 14 in x 30 ft vinyl roll flashing.
Then slip flashing behind the siding covering the top edge of the ledger.
You may need to pry out siding first.
This flashing needs to extend up at least 2 or 3 inches up under the siding above the deck.
Install z flashing behind the bottom of the ledger and over the siding below.
For pricing and availability.
Slip the back flashing under the siding at least 3 at the top and the sides.
To prevent water from seeping behind the deck s ledger board and rotting the board and the siding the flashing must cover the top of the ledger board and bend over the edge.
I would remove the old siding that was behind the existing ledger to about an inch above the deck surface.
Keep in mind the bottom of the upper siding should be at least two inches above the flashing or the decking that s near the house.
My instinct is to replace the deck and eliminate the ledger altogether add posts near the wall and leave a big gap between the end board and new flashing tucked under the siding.
If nails are in the way pull them out.
The irc doesn t provide prescriptive measures for flashing other than the minimum thickness for metal flashing 0 019 in.
Item 3807 model 5504900120.
Tearing into siding is all but inevitable if you build.
A simple metal or plastic cap flashing is probably adequate to flash a deck ledger in a dry climate while the 3 layer system described in this video is suitable for high rainfall and damp climates.
Union corrugating 14 in x 30 ft vinyl roll flashing.
Window and door cap 1 25 in x 120 in x 1 56 in aluminum z flashing.
This keeps water from wicking along the bottom of the ledger and getting behind the siding.
