Siding To Deck Flashing

Galvanized deck ledger flashing fits over deck ledger board and behind siding for protection from water damage.

Siding to deck flashing.

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. You may need to pry out siding first. That should pop the nail head out far enough so you can pry it out. Slip the back flashing under the siding at least 3 at the top and the sides.

Use asphalt paper between metal and pressure treated lumber. The irc doesn t provide prescriptive measures for flashing other than the minimum thickness for metal flashing 0 019 in. The amerimax 8 ft. Painted galvanized steel features a baked on factory finish.

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. Start by making an outline on the siding where you want to position the ledger board. 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. Make the outline large enough to include space for the deck boards on top the ledger and any trim boards on the sides. Pry the siding out near a nail then push the pry bar against the nail as you partially tap the siding back in. 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.

This flashing needs to extend up at least 2 or 3 inches up under the siding above the deck. Then slip flashing behind the siding covering the top edge of the ledger.