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Considering plumbing DWV 2nd bath first down to 4" main where WC meets with wye and then 4x4x2 wye for washer drain (last outlet to main trunk line). Can't do this all in one day, so need to protect the system from critters or debris. Leaving or installing the other 4x4x4 wye for main bath with...

Saw this on forum.....I don't know if this would work because of the one wet venting rule with UPC...but curious. Please disregard this layout...something I saw that was similar but not workable

Redrawn....is this better? Actually WC would be set closer to exterior wall but drain as shown. UPC only allows one group to wet vent then join main.

This my horrible drawing of the proposed system. 1) Can the lav in the 2nd bath and washer vent be combined if vent is 2" or 3", above flood rims (at least 6") and still enable the showers and WC to be wet vented? 2) Showers and lavs joining the main upstream, do the wyes need to be horizontal...

Thank you..working now but will try to lay out this (isometric) later for perusal.

Lurking here and time to register and throw out a plan for input. Will be add-on new construction, 2x6 exterior & interior walls. UPC code area and the home has an existing 4" ABS main 10 away in crawl space. 1) Question where to locate vents? Would like to vent 2"out of the two lavatories or...