How To Install Valley Flashing On A Metal Roof

Install an underlayment centered in the roof valley.

How to install valley flashing on a metal roof.

The top joinery of both valleys when they meet on the same plane of roof is shown here. I have my valley custom made with water trough to help with leaking b. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Open valley shingle installation.

Recommended procedures of basic valley flashing installation. When installing metal valley flashing there are a few things to keep in mind from cutting metal roofing to sealing the flashing. 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. Stop nailing 6 inches from the center.

Then install a non corrosive metal valley flashing of 24 minimum width. 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. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Flashing should be installed in all of the valleys.

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. 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. That flashing is left exposed so the roof has visible lines of metal running down the valley. An open valley relies on metal flashing for protection.

Open valleys have metal flashing to protect this critical area of the roof. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Shingle the other side of the valley the same way.