It is made of galvanized steel and will not rust.
Metal roof dormer valley.
Unlikely but it can.
I have my valley custom made with water trough to help with leaking b.
An open valley relies on metal flashing for protection.
However you need to cut down the middle of the valley so that one side lies against the main roof and the other folds over the dormer peak.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
Preparing to install the panels around the sides of a dormer and up to the valleys.
Fabral metal wall and roof systems.
If you re referring to a dormer roof where two valleys meet from either side then you extend each to about a foot above the dormer peak meets the existing roof.
As the asphalt shingles are installed over the roof deck the shingles are extended into the valley.
That flashing is left exposed so the roof has visible lines of metal running down the valley.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
However these shingles are not run entirely through the valley area but rather the center of the metal valley is left exposed.
However the hole that is created from the nail may eventually leak.
Fabral metal wall and roof systems.
Metal valley will last forever.
Galvanized steel aluminum and copper can all be used.
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 is used.
Shingles in the valley will not last forever and will have to be replaces during a re roof project but the nails will not leak.
Installing dormer valley flashing.