Siding To Deck Flashing

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.

Siding to deck flashing.

Galvanized deck ledger flashing fits over deck ledger board and behind siding for protection from water damage. Start by making an outline on the siding where you want to position the ledger board. You may need to pry out siding first. I would remove the old siding that was behind the existing ledger to about an inch above the deck surface.

Pry the siding out near a nail then push the pry bar against the nail as you partially tap the siding back in. Then slip flashing behind the siding covering the top edge of the ledger. The irc doesn t provide prescriptive measures for flashing other than the minimum thickness for metal flashing 0 019 in. If nails are in the way pull them out.

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. Painted galvanized steel features a baked on factory finish. If the shingle already has flashing on it the kickout flashing has to slip beneath it and you ll have to loosen or remove siding to do this. Fits over leger board and behind siding to protect from water damage.

Use asphalt paper between metal and pressure treated lumber. Make the outline large enough to include space for the deck boards on top the ledger and any trim boards on the sides. That should pop the nail head out far enough so you can pry it out. If the sidewall is stucco or solid wood like ours and you can t open it to get flashing behind it continue the step flashing to the peak of the roof then cover the step flashing with cap flashing.

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. 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.