While the lifespan of home gutters varies depending on weather conditions, proper routine maintenance and other factors, the National Association of Home Builders estimates 20 years as the average life of galvanized steel or aluminum gutters and 50 years for copper gutters.
Similarly one may ask, how far apart can downspouts be?
I am at an inspection (new construction) with a roof pitch of 12/12 and there is a distance of about 100 feet between downspouts. In our neck of the woods I was taught to go by the rule of 20-25 feet for a 4" gutter and 30-35 feet for a 5" gutter system.
How far apart do downspouts need to be?
Answer: Joseph Truini of This Old House magazine suggests that gutters should slope about a half inch for every ten feet in length. But for gutter runs greater than 40 feet, Truini says that it's “best to pitch the gutter down from the middle to a downspout at each end.” 8.
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