Gutters attach to the eaves two ways: to the fascia—the boards that cover rafter ends—or to the roof. Fascia-hung gutters are sturdier and more secure, but if the fascia is nonexistent or covered with crown molding, roof mounting may be your only choice.
For Plumb Fascia: Bracket
Cradles trough from underneath, so it's open and easy to clean. Cast brackets are stronger than stamped ones. Place every 32 inches, or every 24 inches in snow country.