How To Flash A Roof Valley

Step 6 install the flashing.

How to flash a roof valley.

Lay the flashing down in the roof valley and start at the lower end of the roof. Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing. Cut the bottom edge and fold it down over the drip edge. Shingle the other side of the valley the same way.

Stop nailing 6 inches from the center. Use 1 inch galvanized roofing nails. Attach the flashing panel in place at the bottom. Roof one side of the valley running the shingles across it.

Two ways to flash roof edges. Details concrete masonry roofing wrb flashing. One common method is to lay the edge metal under the eaves membrane and over the rake. Now nail this first flashing at both its far ends.

Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch. Make sure to cover the gap at the bottom of the raised ridge.

Make sure that the end of the flashing panel is perfectly in line with the edge of the roof.