How To Install Open Valley Roof

To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Roof one side of the valley running the shingles across it. There are two common methods for completing the flashing of a valley in a shingle roof system.

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How to install open valley roof.

Open valley shingle installation makes use of the metal flashing sheets that need to be installed so that they overlap each other by few inches with the upper piece of sheet is resting over the bottom piece. To secure the roof valley flashing nail it down carefully. First clean the debris out of the valley including sawdust nails and whatever else is in there. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

If you are installing a closed valley the roofer will install shingles to the roof deck and extend the shingles through the valley so that it covers the entire valley area. Only nail at the edges with only enough nails to. When finished the valley and its underlayment will be completely covered with asphalt shingles. Stop nailing 6 inches from the center.

Ensure ice and water protector has been installed along the valley first. One of the details that varies between homes is the method of flashing the valley areas of the roof. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. 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.

Install an underlayment centered in the roof valley. Install synthetic roofing. Shingle the other side of the valley the same way. Closed valleys or open valleys.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. During its installation process the open valley shingle utilizes the w metal flashing which helps in preventing the water from rushing down. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Pros of open valley shingle installation.

Then starting at the base of the. The self adhering section acts as the lining for the valley. With a clean valley you can lay down some peel and stick roofing membrane.

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