Roofing W Valley Flashing

Take care not to place any fasteners in the exposed center area of the metal flashing.

Roofing w valley flashing.

Clip the top corner of shingles along valleys to keep water flow toward center of valley. Slip a piece of sheet metal flashing under the top layer of shingles to protect the bottom layer in the valley while you cut the shingles with a hook blade. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. Nrca lile recommends that roof valley flashing metal for open roof valleys should be 26 gauge 0 45mm galvanized steel or equivalent noncorrosive nonstaining metal.

With a clean valley you can lay down some peel and stick roofing membrane. Be sure to check local building codes to ensure you have the proper width for your application. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Lile points out that valleys lined with roll roofing are not as durable.

Cut the top layer of shingles along the chalkline. Step 9 cut corners and apply cement. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. First clean the debris out of the valley including sawdust nails and whatever else is in there.