How To Flash A Roof Valley

Shingle the other side of the valley the same way.

How to flash a roof valley.

To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch. Details concrete masonry roofing wrb flashing. Attach the flashing panel in place at the bottom. Stop nailing 6 inches from the center.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Use 1 inch galvanized roofing nails. Lay the flashing down in the roof valley and start at the lower end of the roof. Cut the bottom edge and fold it down over the drip edge.

Fold the top of the flashing over the ridge. 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. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Now nail this first flashing at both its far ends.

Two ways to flash roof edges. Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing. Step 6 install the flashing. Roof one side of the valley running the shingles across it.

Make sure to cover the gap at the bottom of the raised ridge.