I am putting in a new toilet connecting into original soil pipe,how much fall is required for the waste pipe?

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Originally Posted by roydean

I am putting in a new toilet connecting into original soil pipe,how much fall is required for the waste pipe?

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Standard minimum is 1" over 4', or 1/4" per foot.

The required fall is 1/4 inch to the foot, however, if elevation's tight and there's no way you can't manage 1/4" to the foot 1/8" is acceptable on larger drain lines.. Good luck, Tom