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Beley 04-07-2012 12:28 AM

Drain Length Before Vent?
 
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I am in the process of finishing by basement, the builder had roughed in a bathroom during construction, however it is in the wrong place for my plans. The toilet is in the right spot but I have had to move/add a shower.

My question is:

How far can a shower drain(2") run before it hits the vent? Also this vent is a wet vent (sink drain), is this acceptable?

Attached is an image of the bathroom as it stands now, pipe is not glued just test fit. Also not drawn is the vent for the sink (as i assume ~8' is to far without a vent)

Alan 04-07-2012 12:41 AM

By my plumbing code, the drainage for that sink would not fly.


Due to it being wet-vented, you are limited to vertical drainage only, which means your trap arm in excess of 90* is no longer a trap arm and is considered horizontal drainage which you have obviously figured out already taking into consideration your assumption that 8' is too far without a vent.


You need to run the drain for the lavatory under the concrete.

Beley 04-07-2012 02:02 AM

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Quote:

Originally Posted by Alan (Post 893471)
...Due to it being wet-vented, you are limited to vertical drainage only, which means your trap arm in excess of 90* is no longer a trap ....

By "vertical drainage only" is that only before it hits the vent?

I have drawn on a different angle to show how i had planed to plumb the sink. I have it going about 18" horizontally after the trap, then it meets the vent and drops about 10" then runs horizontally through the wall.

Alan 04-07-2012 12:49 PM

By vertical drainage only, that means no horizontal drainage before it dumps into the toilet vent.


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