Dormer Valley Flashing Metal Roof

The installer fabricates simple clips or valley flashing cleats whose bent edge interlocks with the folded over or hemmed edges of the metal roof valley flashing to secure the valley to the roof deck.

Dormer valley flashing metal roof.

Recommended procedures of basic valley flashing installation. 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. Then install a non corrosive metal valley flashing of 24 minimum width. Cut the bottom edge and fold it down over the drip edge.

Cut it about 6 long and it will have to be cut in the bend from where it comes into contact with the main roof the extra 6. I have my valley custom made with water trough to help with leaking b. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap. Use roof valley cleats at intervals of 24 o c.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Be sure to check local building codes to ensure you have the proper width for your application. The top joinery of both valleys when they meet on the same plane of roof is shown here. Make sure to cover the gap at the bottom of the raised ridge to keep bugs and ice out.

The ridge flashing on the dormer covers the end of the valleys at the peak and tucks under the main roof. Fabral metal wall and roof systems. Preparing to install the panels around the sides of a dormer and up to the valleys. 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.

When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.