Flashing An Existing Deck With Siding Behind It

Snap a chalk line cut out the siding and tack up the ledger board.

Flashing an existing deck with siding behind it.

Insert the flashing into the mortar joint so that it fits tightly with the wedge. 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. 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. Step flashings are to be installed one per course.

Then slip flashing behind the siding covering the top edge of the ledger. 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. Slip flashing under siding. On the end that will fit into the mortar.

The steps are as follows. 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. 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 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.

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. Cover the top edge of the vertical leg of the flashing with waterproof tar paper or house wrap. 4 leave a gap of 1 inch or more between the the top of the ledger and the edge of the vinyl siding. Grind out the grout along a row of bricks.

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. The flashing has two details worth pointing out. The irc doesn t provide prescriptive measures for flashing other than the minimum thickness for metal flashing 0 019 in. Seal the joint with a high.

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.