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Old 03-18-2011, 01:47 PM   #1
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38' Gutter


The back of my house spans 38 feet long. I have the gutter that was there is 38' long is that too much to have one downspout? or should I split it? What do you need to have for inch per foot? 1/8th inch per foot?

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Old 03-18-2011, 02:15 PM   #2
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38' Gutter


I usually try to shoot for at least 1/8" per foot, for any application that involves channeling water, but, with eaves trough, aesthetics sometimes preclude that much. Nevertheless, for a 38' run, I would definitely go for two downspouts. You could have one at each end, but, again, for aesthetic purposes, I would look at placing them 9-10' in from the end, so that, using 1/8" per foot as an example, you would have a maximim drop of 1-1/4" in a ten foot length of eaves trough, versus 2-3/8" in a 19' run of it.

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Old 03-18-2011, 02:51 PM   #3
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38' Gutter


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Originally Posted by klrz28 View Post
The back of my house spans 38 feet long. I have the gutter that was there is 38' long is that too much to have one downspout? or should I split it? What do you need to have for inch per foot? 1/8th inch per foot?
If you're going to add a downspout, you might as well make them both 3x4.
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Old 03-18-2011, 08:01 PM   #4
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38' Gutter


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Originally Posted by klrz28 View Post
The back of my house spans 38 feet long. I have the gutter that was there is 38' long is that too much to have one downspout? or should I split it? What do you need to have for inch per foot? 1/8th inch per foot?
38' is too long for one downspout unless it's in the middle. Then it depends on how much roof is feeding it, gutter size, & downspout size.

In a situation with only one downspout at the end of a gutter run, you should strive for 1/8"/ft. If you have a downspout at either end, you can get away with hanging it almost level.
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