4 leave a gap of 1 inch or more between the the top of the ledger and the edge of the vinyl siding.
Flashing an existing deck with siding behind it.
If the deck appears to have life left in it and the lacking flashing was discovered during an annual inspection recommended then some repair should be on your to do list.
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.
Then slip flashing behind the siding covering the top edge of the ledger.
Insert the flashing into the mortar joint so that it fits tightly with the wedge.
The irc doesn t provide prescriptive measures for flashing other than the minimum thickness for metal flashing 0 019 in.
Snap a chalk line cut out the siding and tack up the ledger board.
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 photo 2.
The steps are as follows.
Start by making an outline on the siding where you want to position the ledger board.
Since newer installation guidelines do not recommend caulking this joint but instead recommend leaving a small gap and flashing behind the ends of the siding i think it is more prudent to add flashings when it is possible to do so.
Make the outline large enough to include space for the deck boards on top the ledger and any trim boards on the sides.
On the end that will fit into the mortar.
Slip flashing under siding.
The roof deck flange of step flashings are to be fastened to the surface of each shingle in a position whereby the next course of shingles will cover up hide the flashing from view.
Seal the joint with a high.
The vertical flange of the flashing is to extend up behind the adjoining siding.
Though it will take some dismantling and perhaps a replacement deck board or stick of siding following the recommended practices for installed ledger flashing based on your exterior cladding is the best approach.
The flashing has two details worth pointing out.
Step flashings are to be installed one per course.
When slipping the flashing under the siding be sure to slide the flashing to the left or right of the ledger by at least 2.
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.
