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Old 12-07-2009, 04:07 PM   #1
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drains


can a toilet and a bathtub drain down the same pipe?I bought a house a few weeks ago that's been "gutted" and I need to replace a lot of things one of which is the drains in the basement.So again my question is can I connect a bath tub drain to the same drain as a toilet?

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Old 12-07-2009, 04:31 PM   #2
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if you are talking about that each will share a 3" trunk line, then yes they can.

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Old 12-07-2009, 06:05 PM   #3
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That's exactly what I'm talking about. But if they're sharing the same drain, what about sewer gas?
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Old 12-07-2009, 06:36 PM   #4
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Originally Posted by Mr.Phillips View Post
That's exactly what I'm talking about. But if they're sharing the same drain, what about sewer gas?
Each fixture will still have its own trap. Of course the trap for the toilet drain is built into the toilet.

You can "stack vent" the fixtures, meaning if you can run the drain straight down and the vent straight up, you can dump both waste arms into a single fitting called (at least here in the northeast) an "Estabrook" fitting. I'm sure it's called something else in other regions, but the technical description is a 3" Tee Wye w/2" Side Inlet. In this configuration, the two fixtures share a common drain and a common vent stack. You can even tie your lavatory waste arm into the same vent.

You can individually vent each waste arm and then dump each one into a common soil stack or branch drain.

Or you can do a "wet vent" wherein the waste arm for the shower also vents the toilet.

It all depends on the layout of the bathroom and what the framing will give you for choices.
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bath tub, drain, pluming, pvc pipe, toilet


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