Roofing A Valley With Flashing

Fold the top of the flashing over the ridge.

Roofing a valley with flashing.

One of the details that varies between homes is the method of flashing the valley areas of the roof. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Recommended procedures of basic valley flashing installation. Next install a 36 inch wide strip of self adhering bituminous membrane in 10 to 15 foot lengths up the valley.

There are two common methods for completing the flashing of a valley in a shingle roof system. 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. Cut the bottom edge and fold it down over the drip edge. Ensure ice and water protector has been installed along the valley first.

Closed valleys or open valleys. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Stop nailing 6 inches from the center. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.

Only nail at the edges with only enough nails to. Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Make sure to cover the gap at the bottom of the raised ridge. Shingle the other side of the valley the same way.

If eaves flashing is used it should cross the valley centerline each way and be installed before the valley underlayment see eaves flashing discussed in roofing underlayment best practices. To secure the roof valley flashing nail it down carefully. Step 6 install the flashing. W valley flashing protects the critical area of your roof where two slopes come together to form a valley.

Now nail this first flashing at both its far ends. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch. Remember to caulk the underside of the flashing with a sealant. Install an underlayment centered in the roof valley.

Then starting at the base of the. Apply an approximately 3 inch. Roof one side of the valley running the shingles across it.