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TVC15 11-15-2010 03:32 PM

Vent question
 
I'm moving a bathroom sink to a different wall and draining to existing 2" underfloor drain about 6' away. New drain pipe within wall will travel 18" horizontal, 18" vertical to area below floor, another 18" horizontal to connect to existing 2" drain with 1 1/2" vent. Can I use the existing vent? Or, do I have to install a new vent in the wall behind the new sink?

Ltnicks 11-15-2010 06:18 PM

so its 36" from the lav? use a sanitary tee for the arm

TVC15 11-15-2010 07:27 PM

Why would I need a sanitary tee if I'm going from the sink's trap to the existing waste line that already has a vent?

Plumber26 11-15-2010 07:35 PM

Quote:

Originally Posted by TVC15 (Post 534952)
Why would I need a sanitary tee if I'm going from the sink's trap to the existing waste line that already has a vent?


After the trap. the pipe goes horizontal. It has to hit a vent before dropping down to the drain below the floor. If not, it's considered an "s" trap which will, in most cases, cause problems with siphonage. Then you're house will stink and no one will want to visit!:thumbsup:

TVC15 11-15-2010 08:06 PM

Thanks for the explanation. There is a 2" vent pipe for the toilet a few feet away in the same wall my sink will be located. Can I run a horizontal vent pipe into a tee attached to the toilet vent? I believe the horizontal vent pipe has to be 6-8" above the sink.

Ltnicks 11-15-2010 08:23 PM

that would be fine,

it needs to be understood that the vent is not there to serve the drain, it is there to serve the trap

TVC15 11-15-2010 09:59 PM

My next issue - or, maybe it's not a problem. I have to run the horizontal vent pipe through two 2 x 4 studs that are part of a weight bearing wall. (It's not the main weight bearing wall.) Any precautions, comments? There is no attic space for connection to the existing vent.

TheEplumber 11-15-2010 10:20 PM

Quote:

Originally Posted by TVC15 (Post 535034)
My next issue - or, maybe it's not a problem. I have to run the horizontal vent pipe through two 2 x 4 studs that are part of a weight bearing wall. (It's not the main weight bearing wall.) Any precautions, comments? There is no attic space for connection to the existing vent.

just posted today
http://www.diychatroom.com/f7/help-h...x-4-lbw-86793/

TVC15 11-17-2010 07:27 PM

Instead of going across with the 18” trap arm, then down to underfloor area and across to drain; can I run the trap arm 18’ across to the existing toilet vent in the wall? I would use a sanitary tee and create a drain and a vent in the existing toilet vent pipe. Or, do I need a vertical vent line immediately after the trap?

the_man 11-17-2010 07:30 PM

Quote:

Originally Posted by TVC15 (Post 536056)
Instead of going across with the 18 trap arm, then down to underfloor area and across to drain; can I run the trap arm 18 across to the existing toilet vent in the wall? I would use a sanitary tee and create a drain and a vent in the existing toilet vent pipe. Or, do I need a vertical vent line immediately after the trap?

in my code, you have to vent within 3.5 feet on 1.5" pipe you can also use 180 degrees of turn. you'd be good in my state as long as the vent on the wc is at least 2"


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