Installing Valley Flashing On Existing Roof

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.

Installing valley flashing on existing roof.

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. Roof one side of the valley running the shingles across it. Apply an approximately 3 inch. Shingle the other side of the valley the same way.

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. Use roofing nails to install the l shaped flashing flush with the roof and wall then cover it with roofing cement and reattach the roofer s felt. Place the flashing on the upper portion or the upper flange of the batten. Now nail this first flashing at both its far ends.

Install an underlayment centered in the roof valley. No one of this affirmat. Install flashing on existing roof to extend the lifespan of your roof. Many roofers cut the shingles across because they say it s safer.

Remember to caulk the underside of the flashing with a sealant. Step 3 install the flashing. Lay the flashing in a way that an inch of the flashing protrudes over the edge of the upper flange of the batten. Install the valley battens on the sides of the roof that you want to place the valley flashing.

Stop nailing 6 inches from the center. In this video i show you how i do the valleys on a shingle roof. Recommended procedures of basic valley flashing installation.