I am in the process of adding a bathroom in my basement and I am trying to figure out how my house is vented. The house was built in the early 70's and as far as I can tell there is no vents going through the roof, unless they tied into the whirley bird meant to vent the attic.
I can see where the waste lines in the bathroom are connected to the main soil stack which runs back into the basement and out into the sewer.
Is it possible they extended the soil stack into the attic and vented all the fixtures that way?
I have looked and do not see any vent lines coming off the bathroom sink or kitchen sink.
I haven't popped into the attic yet to see what is going on up there, but I am not sure what I am missing?
Is it acceptable to vent using the soil stack if it extends into the attic(and hopefully through the roof)?