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Junior · Guest

I had a washer & dryer relocated to my basement several months ago and just
recently have had a flooding problem. The washer drain tees into an
existing kitchen sink drain, coming from the floor above. We rarley fill
the kitchen sink because we have a dishwasher, but the wife gave the dogs a
bath, filling then draining the sink. This caused water to pour out of the
washing machine drain in the basement below. I was wondering if an
automatic vent placed somewhere in line could solve this problem. I think
the sink itself is vented because I can see a vent pipe coming out of the
roof in it's general location. If an auto vent might help, where would be a
good location for installation? The washing machine has no problem
draining. The problem only occurs when draining a full kitchen sink.

I have created a crude illustration of the situation here:
http://i2.tinypic.com/63h7v40.jpg

Thanks for any advice.