Flashing An Existing Deck With Siding Behind It

Step flashings are to be installed one per course.

Flashing an existing deck with siding behind it. Slip flashing under siding. The steps are as follows. Then slip flashing behind the siding covering the top edge of the ledger. The flashing has two details worth pointing 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 photo 2. Snap a chalk line cut out the siding and tack up the ledger board. The vertical flange of the flashing is to extend up behind the adjoining siding. The irc doesn t provide prescriptive measures for flashing other than the minimum thickness for metal flashing 0 019 in.

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. Start by making an outline on the siding where you want to position the ledger board. Grind out the grout along a row of bricks. Where the back flashing needs to be cut around an obstacle measure for the notch and cut with tin snips or slice several passes with a knife.

On the end that will fit into the mortar. Make the outline large enough to include space for the deck boards on top the ledger and any trim boards on the sides. 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. 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.

4 leave a gap of 1 inch or more between the the top of the ledger and the edge of the vinyl siding. 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. 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. Seal the joint with a high.

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.