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.
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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