How To Install Valley Flashing On Tile Roof

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.

How to install valley flashing on tile roof.

While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Closed valleys or open valleys. Then install a non corrosive metal valley flashing of 24 minimum width.

One of the details that varies between homes is the method of flashing the valley areas of the roof. The top joinery of both valleys when they meet on the same plane of roof is shown here. 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. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. Roof one side of the valley running the shingles across it. Installing a tile roof can be a difficult and laborious process. 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. Whether you are laying brand new roofing tile or replacing damaged ones it is also important to have the right technique. Open valleys have metal flashing to protect this critical area of the roof. Above our photo of an open valley on a clay tile roof demonstrates how a snow guard can block drainage of a roof valley leading to debris clogging.

Install an underlayment centered in the roof valley. Click to enlarge any image the valley flashing for a tile roof should have hemmed edges and be installed with cleats that allow individual sections to expand and contract figure 2 34. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. I have my valley custom made with water trough to help with leaking b.

A project of this size will take a great deal of planning and preparation well before the actual tile installation is underway. Stop nailing 6 inches from the center.