While roll formed gutters are attached with brackets, only to a building's fascia, custom made commercial gutters have a flange back which is fastened directly to the roof. This allows for a much stronger, more reliable attachment. Custom commercial gutters can also be fabricated with metal up to .063 aluminum while rolled gutters are generally made only up to .032. Commercial gutters offer a broad range of colors and styles to match any building project. Gutters can come with a 20-year finish warranty.