There are a number of reasons that could lead to you having to install new gutters, such as: 1)A large number of cracks, holes, or rust spots in your gutter system. 2)Nails or screws on the ground. 3)Gutters separating at seams. 4)Gutters pulling away from the fascia. 5)Sagging or improperly-pitched gutters. 6)Peeling exterior paint. 7)Water pouring over the sides of the gutter.