Valley Flashings For Metal Roof

First clean the debris out of the valley including sawdust nails and whatever else is in there.

Valley flashings for metal roof.

The extra kick at the bottom of the face directs run off away from the structure. Use 1 inch galvanized roofing nails. Install an underlayment centered in the roof valley. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.

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. Then install a non corrosive metal valley flashing of 24 minimum width. Step 6 install the flashing.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels. This drip edge flashing provides protection from water damage along the eaves and rake of a roof. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Fold the top over the roof ridge and cut the bottom along the drip edge metal. With a clean valley you can lay down some peel and stick roofing membrane.

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. Be sure to check local building codes to ensure you have the proper width for your application. Lay the flashing down in the roof valley and start at the lower end of the roof. Lile points out that valleys lined with roll roofing are not as durable.

Attach the flashing panel in place at the bottom. Description documents preformed valley flashing is used to channel water down the roof into the gutters in the roof valley area. Now nail this first flashing at both its far ends. 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.

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.