Valley Flashings For Metal Roof

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.

Valley flashings for metal roof.

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. 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. 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.

Lile points out that valleys lined with roll roofing are not as durable. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels. First clean the debris out of the valley including sawdust nails and whatever else is in there. 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.

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. It s bendable for various pitches. The extra kick at the bottom of the face directs run off away from the structure.

Lay the flashing down in the roof valley and start at the lower end of the roof. Use 1 inch galvanized roofing nails. Fold the top over the roof ridge and cut the bottom along the drip edge metal. 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. Attach the flashing panel in place at the bottom. Remember to caulk the underside of the flashing with a sealant.

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. Overview w valley flashing protects the critical area of your roof where two slopes come together to form a valley. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof.

When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.