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Marc
Marc, Plumber
Category: Plumbing
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Experience:  Plumbing heating & home maintenance contractor
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Can a 4" cast Iron waste pipe layed horizontally be used to

Customer Question

can a 4" cast Iron waste pipe layed horizontally be used to connect a toilet if there is 1/8" pitch for its 9' run
Submitted: 1 year ago.
Category: Plumbing
Expert:  Phil replied 1 year ago.
If the slope were 1/8" per foot, (same as about 1" per 9 feet) is the absolute bare minimum... you should go to great lengths to get the slope to 1/4" per foot.... if the slope is just 1/8" over its full 9 feet of length, it will not be sufficient at all to float solids out of the line and to the main sewer. Tell me a lot about what is limiting room for the proper slope and how long the line is overall. We can go from there.

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