There are several reasons for it.
Metal roof dormer flashing.
Flashing is installed to surround roof features such as vents chimneys and skylights.
In this article veteran remodeler mike guertin shows how to flash a dormer with bombproof details.
The extra kick at the bottom of the face directs run off away from the structure.
This flashing protects your roof from water damage.
This drip edge flashing provides protection from water damage along the eaves and rake of a roof.
Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels.
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.
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.
Underlayment and peel and stick should go higher than the step flashing for.
While the gold standard for roof flashing is soldered copper the fact is that for economic reasons the vast majority of roof flashing is done with aluminum.
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Roofing underlayment can be installed on the roof but hold it back from the roof wall joint.
Lay a bead of roofing cement along the shingles just below the dormer and bed the metal base flashing into it.
This video shows how to install endwall flashing with standing seam panels.
Ideally this custom flashing will have soldered corners but if not carefully notch the metal at the dormer corners and wrap the vertical leg around the corner onto the side wall.
Dormer flashing is installed under the siding and on top of the roof steel at the bottom of a dormer or endwall.
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Cover the connections with peel and stick membrane and then fold the synthetic underlayment up the wall also.
