How To Replace Roof Valley Flashing

Start at the lower end of the valley.

How to replace roof valley flashing.

Cut each side of the flashing at the lower end to conform with the corresponding edges of the roof using sheet metal. Recommended procedures of basic valley flashing installation. If the ice and water shield is missing then you will have to remove the shingles on both sides along the valley put ice and water shield in place and re shingle the roof. Position a new vent pipe flashing over the vent push it down into place and nail where shingles will cover it.

Install an underlayment centered in the roof valley. Place the new piece of sheet metal valley flashing in the valley with the raised center aligned with the center of. Make sure to cover the gap at the bottom of the raised ridge. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

Caulk any openings left and made by the flashing process with a suitable sealant then dust the flashing once it is dry and paint over with granule paint available at hardware stores of your desire. Then install a non corrosive metal valley flashing of 24 minimum width. Fold the top of the flashing over the ridge. With underlayment and flashing installed apply shingles up to one side of the flashing.

Apply an approximately 3 inch. To replace flashing around the vent pipe first remove the shingles covering the flange at the back and sides. Now ask a family member to stand inside the house under the roof valley and then standing on the roof pour a bucket of water onto your handiwork. Pull or cut off any nails.

How to do it. Pry and lift off the flashing. A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water.