How To Install Valley Flashing On A Metal Roof

Flashing should be installed in all of the valleys.

How to install valley flashing on a metal roof.

Stop nailing 6 inches from the center. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Open valley shingle installation. When installing metal valley flashing there are a few things to keep in mind from cutting metal roofing to sealing the flashing.

Roof one side of the valley running the shingles across it. Shingle the other side of the valley the same way. Metal valley trim also known as metal valley flashing is beneficial because it drains water away from the structure of your metal building which helps prevent moisture damage. 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.

Install an underlayment centered in the roof valley. Then install a non corrosive metal valley flashing of 24 minimum width. I have my valley custom made with water trough to help with leaking b. Open valleys have metal flashing to protect this critical area of the roof.

An open valley relies on metal flashing for protection. Recommended procedures of basic valley flashing installation. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. 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.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. The top joinery of both valleys when they meet on the same plane of roof is shown here. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.