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You should try to limit the number of downspouts. The number is really determined by the length of gutter run. If the length is over 25-30 feet you may need a downspout at each end. Otherwise you would not be able to get enough pitch or slope on the gutter for it to drain properly. Aslo look to place downspouts where the excess water can easily drain away the house and foundation.

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Q: How many downspouts do you need on a house?
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