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Unread 07-12-2007, 08:57 AM   #8
Brian in San Diego
AC Specialist -- Schluterville Graduate
 
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Join Date: Oct 2005
Location: La Quinta, CA and Usk, WA
Posts: 10,791
Tae,

Hold on a minute! I think you are trying to do something that isn't quite kosher. The first thing is that it has to be trapped after the drain. In the case of your sink, the trap is right under the sink. With a shower, your trap is in the floor space below the shower drain or in the slab. Second, the line has to be vented prior to entering the waste stack. If you look at your picture, you'll see that the vent comes right off the top, therefore it's vented prior to entering the waste stack. Once you get the subfloor up, maybe there will be another way, but you cannot do it the way you've described.

In regard to your original question #2, I think the drain would have to be 2" minimum branched to two 1.5"...same rules apply, the line has to be vented prior to entering the waste stack.

Brian
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Last edited by Brian in San Diego; 07-12-2007 at 09:03 AM. Reason: more info
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