http://nomoreleaks.net/ This is a dormer in Rock Island ,Illinois that had been leaking for some time.When we first took it apart we didn’t see the leak until we got to the corner.Dormers normally leak in two areas.
First would be the flashing on the sides.
Second would be the corners.
In this case it was the corn so this is how we fixed it.We removed all of the siding and flashing.Then we took up the shingles next to the dormer.We installed ice guard up the wall and out on the roof.
we reinforced the corner with ice guard and with new metal flashing.
Finally we step flashed the dormer and reinstalled the siding.This should help to make sure they don’t have a problem again.