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Adding sink, do I need to re-vent?

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Adding sink, do I need to re-vent? Phisherman 06-17-2008
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Posted by Phisherman on June 17, 2008, 3:37 pm
I am adding a basement utility sink 3.5 feet from the basement stack.
How far from the stack would a re-vent be needed to be in compliance
with the US Plumbing code? If not needed by local code, what would be
gained by re-venting this sink? I plan to use this sink to drain a
washing machine.

Posted by RicodJour on June 17, 2008, 4:38 pm
> I am adding a basement utility sink 3.5 feet from the basement stack.
> How far from the stack would a re-vent be needed to be in compliance
> with the US Plumbing code? If not needed by local code, what would be
> gained by re-venting this sink? I plan to use this sink to drain a
> washing machine.

If the new sink is on the uphill side of the stack, you can probably
just use an air admittance valve.
http://www.studor.com/index2.htm

R

Posted by Joe on June 17, 2008, 7:35 pm
> I am adding a basement utility sink 3.5 feet from the basement stack.
> How far from the stack would a re-vent be needed to be in compliance
> with the US Plumbing code? =A0If not needed by local code, what would be
> gained by re-venting this sink? =A0 I plan to use this sink to drain a
> washing machine.

Washing machines often have quite aggressive pump discharges. A
combination of that and a load of suds could overpower some sink
configurations. Code or not, a good vent looks like a way to avoid
future problems. Cheap insurance. really.

Joe

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