Problem with DWV

I recently gave a thorough look at me 50+ years old house plumbing as I am going to build a bathroom in the basement and I need to change it. What I found is that my kitchen sink, lavatory on first floor bathroom, washing mashing in basement and utility sink in basement do not seem to be vented. They all drain in main 3" drain stack. All second floor bathroom fixtures also drain in the same stack. I believe the main stack eventually goes through the roof as a vent. As far as I understand all fixtures vents must connect to main stack above all drains so I came to conclusion that first floor bathroom fixtures and basement fixtures (washing machine and utility sink) are not vented properly. Can this really be in 50+ house or my house as an unpleasant exception? I live in central NJ. I actually have a 2" vent that goes from basement but only first floor toilet uses it. Can I use this vent to vent other fixtures too or the vent size is too small?
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Alexander Galkin wrote:

I used to have problems with my DMV. I final toled them to stick there registration and vehicle license fees up their arses!
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Alexander Galkin wrote:

The 2" vent should be fine to vent the additional fixtures.
The 3" drain may be too small to add an additional toilet (technicality).
If you *really* want to know the limitations, you'd have to ask the town inspector.
Jim
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