Valley Flashings For Metal Roof

With a clean valley you can lay down some peel and stick roofing membrane.

Valley flashings for metal roof.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. This drip edge flashing provides protection from water damage along the eaves and rake of a roof. 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.

When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. 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. Remember to caulk the underside of the flashing with a sealant. First clean the debris out of the valley including sawdust nails and whatever else is in there.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. 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. Lay the flashing down in the roof valley and start at the lower end of the roof. 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.

The extra kick at the bottom of the face directs run off away from the structure. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Use 1 inch galvanized roofing nails. Step 6 install the flashing.

Install an underlayment centered in the roof valley. Now nail this first flashing at both its far ends. Lile points out that valleys lined with roll roofing are not as durable. Be sure to check local building codes to ensure you have the proper width for your application.

It s bendable for various pitches. Description documents preformed valley flashing is used to channel water down the roof into the gutters in the roof valley area. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. 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.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.