Architectural shingle installation is especially critical in roof valleys where iko recommends an open valley installation.
Install flashing on roof valley.
To understand what makes a valley either closed or open it is important to understand how a valley is constructed.
Installing metal flashing for your roof project is a challenging but essential step to take to ensure that the new roof remains as weatherproof and as strong as possible the following steps will explain how to install metal flashing in roof valleys.
Step 6 install the.
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.
Step 5 begin installation.
Valley flashing this flashing is usually formed in a v or w shape and is used where two different roof planes meet forming a valley.
Roof one side of the valley running the shingles across it.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
Now nail this first flashing at both its far ends.
Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.
Install an underlayment centered in the roof valley.
Drip flashing also called drip edge this type of flashing is installed on the edge of roofs and helps guide water away from your roof and into your gutters.
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.
Closed valleys or open valleys.
There are two common methods for completing the flashing of a valley in a shingle roof system.
Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.
Stop nailing 6 inches from the center.
Flashing should be installed in all of the valleys.
Remember to caulk the underside of the flashing with a sealant.
Then install a non corrosive metal valley flashing of 24 minimum width.
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.
Learn the three methods of shingling a roof valley the advantages and disadvantages of each how to choose valley flashing and how to shingle an open valley.
Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.
Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
