Open Valley Roof Flashing

Step 9 cut corners and apply cement dub cut the top layer shingles see step 4 in open metal valley above.

Open valley roof flashing.

After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. W type valley flashing is more rigid for handling so it stays straight and it stops waler rushing down one side of a roof from rushing back up the other side. 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. Be sure to check local building codes to ensure you have the proper width for your application.

An open valley relies on metal flashing for protection. Cut the bottom edge and fold it. Cut bottom of flashing so the entire width of the valley flashing extends approximately 1 2 to 3 4 over the fascia trim board along eaves the following photos illustrate removal and replacement of a closed cut valley with new open metal valley. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.

Extend entire width of flashing completely to the bottom of the roof valley. Lile points out that valleys lined with roll roofing are not as durable. This metal lining can be made of any type of metal that is resistant to the effects of weather acid rain or other contaminants. Slip a piece of sheet metal flashing under the top layer of shingles to protect the bottom layer in the valley while you cut the shingles with a hook blade.

Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters in a previous video we covered how to flash roof edges before shingling. Some homeowners do not like the look of open valleys while others feel the metal accentuates the roof s shape particularly if copper or painted flashing is used. Fold the top of the flashing over the ridge and nail it off every ten inches or so along the outer edge of the flashing now this valley will carry water off the roof and away from the house. Open valley when compared to a closed valley and open valley adds an additional layer of lining.

Product overview w valley flashing protects the critical area of your roof where two slopes come together to form a valley. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap. In comparison to a closed valley an open valley adds another layer of lining into the valley. How to flash an open valley with w type valley metal.

After the underlayment is placed a pre bent metal valley lining is installed.