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From various sources I gathered that the minimum fall (slope) is 1cm fall over 1m distance. Converted that is 0.125 (1 eighth) inch fall over 1 foot distance.

The maximum that should not be exceeded is 1cm fall over 20cm distance. Converted that is 0.25 (1 quarter) inch fall over 4 foot distance.

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16y ago
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15y ago

Depends on diameter as what the code requires When I install 8" pipe I can use 1/16 pitch BUT less fixture units

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Q: How much fall in a toilet drain pipe?
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