Installing Valley Flashing On Existing Roof

Step 3 install the flashing.

Installing valley flashing on existing roof.

Recommended procedures of basic valley flashing installation. Roof one side of the valley running the shingles across it. Finally reattach all shingles removed in the process. 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.

Many roofers cut the shingles across because they say it s safer. Shingle the other side of the valley the same way. Place the flashing on the upper portion or the upper flange of the batten. Install flashing on existing roof to extend the lifespan of your roof.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. 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. Stop nailing 6 inches from the center. Apply an approximately 3 inch.

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

No one of this affirmat. 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. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.