Failed inspection! Advice?

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Tom Sawyer

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I would have used a double 4x3 wye to pick up both toilets, a double 4x2 wye for the tub and showers, a 4x2 to pick up the master bath lav, a 4x2 combo for the closer lav and a 4x3 combo for the vent stack although these days you could go with a 4x1-1/2 for the stack. Alternately the close lav could have dumped into the stack also provided the distance was correct.
 
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hj

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Now to confuse things even further, a "wet vent" means that there is a fixture upstream of the fixture, "washing' the vent out. Given that, even if that pair of toilets were connected in any of these ways, the sink/washer at the end would provide the wet vent, and their distance from the toilets would eliminate any venturi effect caused by the flow.
 

Tom Sawyer

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Unfortunately, many years back when wet venting was introduced, a lot of plumbers got the notion that the wet portion of the vent was washed and it is, but the washing isn't the important thing. The air circulation over the top of the waste is. With the introduction of low flow toilets the arrangement of fixtures has been deemed to no longer matter and modern toilets do not create the Venturi effect. It is however, important that the fixtures being served within the wet vent group be within the proper distance to the wet vent which precludes his having the washer and laundry sink as the wet vent fixture. That and a washing machine can never be used in any part of the wet vent system because it can indeed create that Venturi effect and it may discharge fast enough to temporarily block the vent causing pressures in the system to exceed standards for residential system design.
 
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