Gutter slope and downspout layout — pitch to the downspouts, crown long runs
Gutters slope at least 1/16″ per ft toward the downspouts — 1/8″ is the CDA recommendation (a long run crowns in the middle and falls both ways). No downspout should drain more than 50 ft of gutter — plus add more wherever the roof area exceeds the gutter’s capacity.
What this diagram shows
An elevation of a gutter run along the eave. The gutter is not level: it pitches at least a sixteenth of an inch per foot, and preferably an eighth, toward a downspout so water drains instead of pooling. A long run is crowned at a high point in the middle and slopes both ways to a downspout at each end. Each downspout drains no more than 50 feet of gutter, and add another wherever the roof area feeding the run is more than the gutter size can drain.
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