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1/4 " per Foot minimum. At least this is what I get out of "Code Check", ISBN # 1-56158-409-6. There is a lot to Plumbing on how pipes are sized, vented and connected. This book is worth getting-I found it on E-bay for less than $10.00.

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Q: How much slope per foot is needed for a sink drain pipe?
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All drains slope 1/4 inch per foot, minimum. Too much slope,though, can mean pulling water out of the trap or goose neck on a toilet.


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One quarter inch per foot is standard "slope". This equates to a quarter bubble on a level. If you don't have at least one eighth of an inch "slope", your drain will not work properly and will clog constantly.


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