How To Flash A Roof Valley

Fold the top of the flashing over the ridge.

How to flash a roof valley.

Roof one side of the valley running the shingles across it. One common method is to lay the edge metal under the eaves membrane and over the rake. Stop nailing 6 inches from the center. Attach the flashing panel in place at the bottom.

Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Remember to caulk the underside of the flashing with a sealant. 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.

Step 6 install the flashing. Details concrete masonry roofing wrb flashing. Now nail this first flashing at both its far ends. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Cut the bottom edge and fold it down over the drip edge. Use 1 inch galvanized roofing nails. Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing. 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.

Shingle the other side of the valley the same way.