Installing Valley Flashing On Existing Roof

Install the valley battens on the sides of the roof that you want to place the valley flashing.

Installing valley flashing on existing roof.

Recommended procedures of basic valley flashing installation. Remember to caulk the underside of the flashing with a sealant. Step 3 install the flashing. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Install flashing on existing roof to extend the lifespan of your roof. Many roofers cut the shingles across because they say it s safer. 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. Finally reattach all shingles removed in the process.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Now nail this first flashing at both its far ends. Install an underlayment centered in the roof valley. 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. Shingle the other side of the valley the same way. Lay the flashing in a way that an inch of the flashing protrudes over the edge of the upper flange of the batten. Roof one side of the valley running the shingles across it.

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. Stop nailing 6 inches from the center. 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.