Ask whether the runs will be formed at your house, and which metal and thickness the company uses. Aluminum is the most common gutter metal, and This Old House recommends .032-inch stock over the thinner .025-inch because it holds up better.
Ask what size they plan. Five-inch gutters suit most average-sized roofs; on a big or steeply pitched roof, ask about stepping up to 6-inch gutters with larger 3-by-4-inch downspouts, which move more water. Rain here comes hard and often: Atlanta’s airport, the closest station with a full 30-year NOAA normal, averages about 50 inches a year and close to 15 days with an inch or more, the kind of storm that shows whether a gutter is big enough.
Ask how the corners, end caps and outlets will be sealed, since those are the joints that remain, and what will hold the runs up. Hidden hangers screwed into the fascia generally outlast the older spike-and-ferrule kind, which tends to loosen over time.
Before you sign, have the quote spell out each run’s length, the gutter width, the metal gauge and how many downspouts are included. Request a certificate of liability insurance too, since SirGutters builds this list from company websites alone and has not looked into anyone’s license or insurance.