I met a plumber I think I want to use but wanted to ask a question about something he said. He was telling me about wet and dry vents which I found interesting and he also told me about some codes in certain areas require a wet vent for each fixture. Well a long story short he told me that if he was to do the job that if I didnr have a problem with it that he would rather use two 2" vents rather than one 4" and that way I can have a 2x4 wall rather than a 2x6 wall and I would have two wet vents for each bathroom rather than one 4" and all the 2" pipes would all come together in the attic and exit through the roof with either a single 3" or 4"
Does this sound alright ? Advantages/disadvantages ? Thoughts please.