Gutter and Downspout Sizes | Best Pick Reports
Gutters are typically in five-inch or six-inch sizes. Six-inch gutters are usually required around steep roofs to minimize overflow potential. Downspouts are usually two inches long by three inches wide or three inches long by four inches wide. Larger downspouts drain faster and do not clog as easily, which lessens the stress on gutters and adds to their years of optimal performance.