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thanks for reply !! similar situation here but the vent runs vertically from the point it exits the slab to the next floor ( 8 ft -- ish ) and then jogs over horizontally approx 3 ft before rising vertically thru ceiling of next floor into attic -- so i think i am good as far as practically...

thanks for reply !! i looked at that and like you said looks good ! -- AND it answers my question regarding the IPC Common Vent actually being a special case of a vertical wet vent at least for practical considerations

it comes out of the concrete slab thru the floor plate/sill and is approx 2 ft from the floor drain with no other fixtures closer than 15 ft -- so, good question and i am assuming dry and no branches --- do you think if i/plumber uses a transponder i could determine w better certainty ...

hi, first post here but thanks to all posters and esp. Terry !! anyway, i currently have a floor drain w a dry vent that goes up thru floor, thru ceiling, crosses over and joins another vent and then out roof. this is 70s house with what appears to be convential venting ( a vent for each...