Valley Flashings For Metal Roof

Now nail this first flashing at both its far ends.

Valley flashings for metal roof.

Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. It s bendable for various pitches. Install an underlayment centered in the roof valley. Overview w valley flashing protects the critical area of your roof where two slopes come together to form a valley.

Remember to caulk the underside of the flashing with a sealant. 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. Be sure to check local building codes to ensure you have the proper width for your application. This drip edge flashing provides protection from water damage along the eaves and rake of a roof.

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. With a clean valley you can lay down some peel and stick roofing membrane. Use 1 inch galvanized roofing nails. First clean the debris out of the valley including sawdust nails and whatever else is in there.

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. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. Attach the flashing panel in place at the bottom.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels. Lile points out that valleys lined with roll roofing are not as durable. Then install a non corrosive metal valley flashing of 24 minimum width.

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Lay the flashing down in the roof valley and start at the lower end of the roof. Description documents preformed valley flashing is used to channel water down the roof into the gutters in the roof valley area.

The extra kick at the bottom of the face directs run off away from the structure.