Install an underlayment centered in the roof valley.
Valley flashings for metal roof.
Remember to caulk the underside of the flashing with a sealant.
Step 6 install the flashing.
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.
Then install a non corrosive metal valley flashing of 24 minimum width.
It s bendable for various pitches.
This drip edge flashing provides protection from water damage along the eaves and rake of a roof.
Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.
Be sure to check local building codes to ensure you have the proper width for your application.
The extra kick at the bottom of the face directs run off away from the structure.
Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels.
With a clean valley you can lay down some peel and stick roofing membrane.
Drip edge metal valley flashing dormer chimney and kick out flashing shed water away from the connections between roofs walls chimneys and other building assemblies this collection of 18 articles animations and videos identifies the critical roof flashing areas illustrates durable roof flashing details and shows how to flash roofs right in the real world.
Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.
First clean the debris out of the valley including sawdust nails and whatever else is in there.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
Lile points out that valleys lined with roll roofing are not as durable.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
Now nail this first flashing at both its far ends.
The valley flashing shall extend not less than 8 inches 203 mm from the centerline each way and shall have a splash diverter rib not less than 3 4 inch 19 mm in height at the flow.
Attach the flashing panel in place at the bottom.
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.
Overview w valley flashing protects the critical area of your roof where two slopes come together to form a valley.
Roof valley flashing shall be of corrosion resistant metal of the same material as the roof covering or shall comply with the standards in table r905 10 3 1.
Lay the flashing down in the roof valley and start at the lower end of the roof.
Use 1 inch galvanized roofing nails.
