Installing Valley Flashing On Existing Roof

Lay the flashing in a way that an inch of the flashing protrudes over the edge of the upper flange of the batten. 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. Roof one side of the valley running the shingles across it.

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Installing valley flashing on existing roof.

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

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. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Install flashing on existing roof to extend the lifespan of your roof.

Many roofers cut the shingles across because they say it s safer. 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 an underlayment centered in the roof valley. Shingle the other side of the valley the same way.

Finally reattach all shingles removed in the process. Step 3 install the flashing. 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. Apply an approximately 3 inch.

Install the valley battens on the sides of the roof that you want to place the valley flashing. Place the flashing on the upper portion or the upper flange of the batten. Now nail this first flashing at both its far ends.

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