Hi, I’m trying to install a second story bathroom in an unfinished attic space in an old house. Currently downstairs has a tub, sink and toilet vented to a 3” cast iron stack. I want to run a separate 3” drain from upstairs and connect either in the crawlspace or in the utility closet space in the first floor. I’m wondering if I can have the second floor bathroom drain above the first floor creating a small section of a wet vent. Will the first floor toilet have enough air? The bathrooms are right above eachother.
Currently the downstairs bathroom has the tub, sink and toilet all vented to the main stack but aren’t vented individually. I may add some additional vents for these next year but for now the bathroom seems to drain fine.
Currently the downstairs bathroom has the tub, sink and toilet all vented to the main stack but aren’t vented individually. I may add some additional vents for these next year but for now the bathroom seems to drain fine.