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ccbrands1
12-20-2006, 05:56 AM
Drain rough in for a 1/2 bath in basement.
1 1/2" vent at the vanity drain line.
Toilet drain is upstream of the vent.
Drains beneath concrete.
I want to add a shower into the mix.

I plan to install a 3 x 2 wye after the vent for the vanity drain line.
Is it ok to run the shower drain line in this way?
Or should it be tapped in between the vent and the toilet?

Code references would be great, but general comments on how either way would effect drainage would also be good.

thanks

ccbrands1
12-20-2006, 06:35 AM
so to elaborate, can I place my 3 x 2 wye in the spot in the attatched diagram?

ccbrands1
12-20-2006, 06:38 AM
diagram here

prashster
12-20-2006, 06:44 AM
My nonpro opinion is that it will work. I'd also run run a shower vent off the shower branch drain b4 it hits the main line. This means running the shower branch drain under a wall b4 it hits the main drain.

Toilet venting confounds me. I know it's advisable for each fixture to have it's own vent, but I know there are exceptions and the wet vent you have might be permissible for the toilet. I'd check though.

That's just me, though.

Also, the 'tee' that connects the sink vent to the main line should be a wye, and the 'tee' that connects the sink trap arm to the vent/drain should be a sanitary tee or better.

geniescience
12-20-2006, 07:55 AM
--> Distances determine whether a vent can be used for two fixtures or only one.
1 1/2" vent at the vanity drain line.
Toilet drain is upstream of the vent. so far so good, all is normal. Toilets are always the farthest upstream, and the first vent in the system is the toilet's vent.
Drains beneath concrete.not sure what this means precisely.
I plan to install a 3 x 2 wye after the vent for the vanity drain line.
Is it ok to run the shower drain line in this way?
Or should it be tapped in between the vent and the toilet?
perfectly normal to do it this way. Totally not good to do it the opposite way that you described, i.e. between the vent and the toilet.

The big unanswered questions are distances. This is important; it determines whether a vent can be used for two fixtures or only one.

david

ccbrands1
12-20-2006, 08:09 AM
sorry...i meant that the drains are underneath concrete...you probably assumed this considering it is in a basement

toilet drain is about 2 - 3 feet from vent

shower drain is about 4 - 5 feet from where it will tap into the main drain line.

shower drain tap on main line can be within 1 foot of the vent if needed.

please advise if these distances would be sufficient.