Metal Roof Valley Flashing Dormer

Fabral metal wall and roof systems.

Metal roof valley flashing dormer.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Install an underlayment centered in the roof valley. Drip edge metal valley flashing dormer chimney and kick out flashing shed water away from the connections between roofs walls chimneys and other building assemblies this collection of 18 articles animations and videos identifies the critical roof flashing areas illustrates durable roof flashing details and shows how to flash roofs right in the real world. Virtually every house in america has at least one vent pipe or other penetration on the roof.

Product overview 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 lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer. Be sure to check local building codes to ensure you have the proper width for your application.

Use roof valley cleats at intervals of 24 o c. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. Using clips permits movement in the valley as temperatures change. 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.

Flashing is installed to surround roof features such as vents chimneys and skylights. Simply put roof flashing is any piece of sheet metal that forms a joint between the roof and objects that protrude from the roof such as dormers chimneys and pipes in such a manner that they prevent water from leaking through the joint. Preparing to install the panels around the sides of a dormer and up to the valleys. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

With a clean valley you can lay down some peel and stick roofing membrane. In this article veteran remodeler mike guertin shows how to flash a dormer with bombproof details.