Soil pipe gradient

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Old 12-04-19, 06:44 AM
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Soil pipe gradient

What is the maximum fall per foot for a soil pipe
 
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Old 12-04-19, 06:48 AM
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Maximum?

The general min slope is 1/4" per ft!
 
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Old 12-04-19, 07:05 AM
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And the maximum? I read somewhere that the maximum gradient for soil pipe is 3 inches per foot, is this correct? Isn’t this too steep? Wouldn’t such gradient cause the water to travel fast leaving the soil behind?
 
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Old 12-04-19, 09:08 AM
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There is no maximum, only a minimum slope.

There is an old wives tale that too steep a slope causes solids and liquids to separate and causes clogging but that's totally bogus. It ranks up there with mixing vinegar and baking soda together for cleaning (if you remember high school chemistry they neutralize each other and only makes nasty tasting salt water... but it's good for science fair volcanoes).
 
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Old 12-04-19, 10:02 AM
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Thanks mate, I appreciate the advice that many ideas are just work as theories but not in practice! I will proceed with 4inch gradient per meter for a 6.5m long soil pipe.
 
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Old 12-04-19, 10:48 AM
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If you have a sink and shower/tub also draining down this pipe try to plumb them so they enter upstream from the toilet.
 
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