Bathroom Drain Layout

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Old 02-14-09, 06:57 PM
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Bathroom Drain Layout

I'm completely re-doing my 5'x9' bathroom and the plumbing. I was wondering if this drain layout is ok. From my basic understanding I'm close enough to the stack to "stack vent" everything.

My questing is, am I able to tie into the 3" toilet drain on it's way to the stack? If I can tie into it, how many times can I tie into it, and do I have to come in from the top? or can I come in from the side?

If possible I thought I would put a 3" coupler with a 2" or 1 1/2" Y on each side in between the toilet and the stack and tie the shower and sink into it.

The joists run across the drains. Top to bottom in this picture. The ceiling below will be lowered to accommodate the drains.

Obviously this overhead picture is overly simple and each fixture would have a trap. The sink is actually vented separately into the attic where it ties into the stack.

Any ideas or suggestions are appreciated!

 
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Old 02-15-09, 12:33 PM
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not even close unless you vent each additional fixture individually.

here is what you are talking about doing but is not what your picture shows. note how all the other drains connected and wet venting the toilet are above the toilet drain

 
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Old 02-15-09, 07:20 PM
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I've been doing some searching and I found that they make a 3x3x3x2x2 fitting. This will make my life much easier. I can run all of the drains directly to the stack.

 
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