Valley Flashings For Metal Roof

Overview w valley flashing protects the critical area of your roof where two slopes come together to form a valley.

Valley flashings for metal roof.

Remember to caulk the underside of the flashing with a sealant. Be sure to check local building codes to ensure you have the proper width for your application. Description documents preformed valley flashing is used to channel water down the roof into the gutters in the roof valley area. Install an underlayment centered in the roof valley.

Use 1 inch galvanized roofing nails. It s bendable for various pitches. Fold the top over the roof ridge and cut the bottom along the drip edge metal. First clean the debris out of the valley including sawdust nails and whatever else is in there.

Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. The extra kick at the bottom of the face directs run off away from the structure.

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. Lile points out that valleys lined with roll roofing are not as durable. Now nail this first flashing at both its far ends. 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.

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. With a clean valley you can lay down some peel and stick roofing membrane. 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. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.

Lay the flashing down in the roof valley and start at the lower end of the roof. Step 6 install the flashing. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. 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.