Hello, I am redoing the laundry area in my 1967 home. Currently there is a 1.5 inch laundry stack that I will be changing to 2" to accommodate the new washer capacity. I have an original utility sink in the garage that (looks like) wet vents the washer. My plumber says that in the current configuration, even with 2" expansion, it is illegal to have utility sink wet venting like this. The only code compliant solution is to deprecate the sink and have a dedicated stack only for washer machine. I trust him, but want to understand the rationale behind the regulations and educate myself. Is this really the case and can anything be done to save the utility sink and be code compliant?
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