Specifically, why do I need to have gutters on second floor roofs when there's a roof right below it? I'm getting ready to replace gutters on my 210 year old house, and trying to save some money, as well as the hassle of cleaning gutters. In some areas, the second floor roof is only 6-8 feet off of the first floor porch roof. Can't the rain simply fall onto those lower roofs without having a gutter system?