Wondering if this line needs a vent?

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Old 12-16-12, 01:55 PM
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Wondering if this line needs a vent?

The sink has a p-trap of its own and the laundry sink does not. None off these runs are more than 24 inches (they are on a common wall).

Was going to install a cheater vent on the sink leg? or is it vented enough from the laundry sink?

Thanks!

Note: I already know I am an awesome artist... ha ha.
 
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Old 12-16-12, 06:34 PM
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The laundry sink definitely needs a P-trap. Also, the trap at the bottom of the sinks (in red) shouldn't be there. It looks like this may have been a washing machine standpipe converted incorrectly. Each fixture needs is own trap, and only one trap.

And yes, the two sinks should have a vent. An AAV might be a good solution, though they aren't approved for use everywhere. Check your locak codes.
 
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Old 12-16-12, 07:01 PM
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The 2 inch trap at the bottom cannot be removed easily (it is under the slab). If that trap remains could that be a good enough p-trap for the laundry sink?

I was told it isn't a double trap if there is a vent for each trap??
 
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Old 12-16-12, 08:07 PM
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I was told it isn't a double trap if there is a vent for each trap??
Who told you that? What were their qualifications? Anytime the same water travels through two traps you have a double trap situation. While it would still be wrong it would be better to have no trap on either sink.

And yes, a vent is still necessary.
 
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Old 12-16-12, 08:08 PM
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Could you redraw the diagram and show all traps and line?

Zorftdt seems spot on........But confirm..
 
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Old 12-17-12, 01:11 PM
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Here is what I read about double traps:
Trap question - Page 2 - InterNACHI Inspection Forum
 
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Old 12-17-12, 01:20 PM
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Post # 10 IRC or UPC no dual traps allowed. Only when tied into the vent with a combination fitting.

Trap question - InterNACHI Inspection Forum
 
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Old 12-17-12, 11:09 PM
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OK appreciate the input! Someone also told me that consecutive p-traps were OK if there were a smaller size pipe on the first one. Is there any truth to that one?

I find all his pretty confusing. So the best move for me might be to remove the trap on the regular sink and then vent that run...
 
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Old 12-18-12, 05:24 AM
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OK appreciate the input! Someone also told me that consecutive p-traps were OK if there were a smaller size pipe on the first one. Is there any truth to that one?
IMO No.

If you draw a better pic possibly we can help you better. But there are stickys at the top of this forum with code pages listed. You can read through them.

Although Canada may do things different. Sorry I did not catch that before. You should really call your local authority and ask them.


 
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Old 12-18-12, 10:10 AM
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Check this out...

"If a vent is put between 2 traps it would work. "

Double trap OK? Rough in piping + tub trap
 
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Old 12-18-12, 10:33 AM
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"If a vent is put between 2 traps it would work. "

Only when tied into the vent with a combination fitting.
Yes I said that .

 
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Old 12-18-12, 10:37 AM
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Old 12-18-12, 12:55 PM
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Great input Mike. Appreciate the details.
 
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