Gutter On Angled Fascia Boards
Best Method for Installing Gutter on Angled Fascia Board
Gutters installed on an angled Fascia board should be installed as level as possible.
This is done with the use of gutter wedges (sometimes called "gutter shims"). They are attached to the back of the gutter and are cut to the degree of the roof slope.
Proper installation of a gutter wedge