Proper Roof Valley Flashing

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

Proper roof valley flashing.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley 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. First clean the debris out of the valley including sawdust nails and whatever else is in there. Install an underlayment centered in the roof valley.

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. Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Be sure to check local building codes to ensure you have the proper width for your application. Recommended procedures of basic valley flashing installation.

Lile points out that valleys lined with roll roofing are not as durable. Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies. Ah yes the dreaded who needs to install step flashing or even a kick out flashing. In this area of new jersey roofing contractors do not use valley flashing but shingle continuously into and out of the valley.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. At the top of the valley you should have a 2 gap it should increase by 1 8 of an inch for every foot of valley. Paul minn area contractors. However in the midwest st.

Penny wise but pound foolish x 2. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. With a clean valley you can lay down some peel and stick roofing membrane. Properly sized and installed valley flashing is key to channeling water safely off the roof.

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