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The slope of the pipe is determined by the size of the pipe and the volume expected to run through it. 2 1/2 inch or less = 1/4" per foot 3 to 6 inch = 1/8" per foot 8 inch and larget = 1/16th per foot This information is in the International Plumbing Code 2006, Table 704.1. You should check with your local building department to verify this information is applicable in your area. Hope this helps! Terry, CBO

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16y ago
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13y ago

Depends on the size of the pipe and your local code-But 1/4 inch fall per foot will accomdate every size pipe in every code.

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Q: What are the minimum falls required on internal drainage pipes?
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