Dormer Valley Flashing Metal Roof

Install an underlayment centered in the roof valley.

Dormer valley flashing metal roof.

Metal roof flashing installation. Preparing to install the panels around the sides of a dormer and up to the valleys. W valley flashing protects the critical area of your roof where two slopes come together to form a valley. Then install a non corrosive metal valley flashing of 24 minimum width.

Flashing is often installed to surround critical roof features such as skylights vents and chimneys. Be sure to check local building codes to ensure you have the proper width for your application. 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. Roof valleys and flashing are simple yet critical components of any roof.

When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. Recommended procedures of basic valley flashing installation. Cut the bottom edge and fold it down over the drip edge. In modern roof systems valleys are typically gutter like metal troughs made of lead fiberglass or concrete.

Make sure to cover the gap at the bottom of the raised ridge to keep bugs and ice out. How to flash a metal roof. Fabral metal wall and roof systems. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. 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. Using clips permits movement in the valley as temperatures change. Use roof valley cleats at intervals of 24 o c.

Such as a dormer or a wall.