Installing Valley Flashing On Existing Roof

Stop nailing 6 inches from the center.

Installing valley flashing on existing roof.

Finally reattach all shingles removed in the process. Install flashing on existing roof to extend the lifespan of your roof. Remember to caulk the underside of the flashing with a sealant. Roof one side of the valley running the shingles across it.

Recommended procedures of basic valley flashing installation. Many roofers cut the shingles across because they say it s safer. In this video i show you how i do the valleys on a shingle roof. 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.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Place the flashing on the upper portion or the upper flange of the batten. Install the valley battens on the sides of the roof that you want to place the valley flashing. 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.

Shingle the other side of the valley the same way. A batten is a roofing component made of a thin layer of metal plastic or wood and is used as a fixing point for roof tiles and roofing sheets. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Install an underlayment centered in the roof valley.

Apply an approximately 3 inch. Now nail this first flashing at both its far ends. Lay the flashing in a way that an inch of the flashing protrudes over the edge of the upper flange of the batten.