allowable number of fixtures on one stack?
I know very little about plumbing, and have learned a lot more through posts on this site. I have learned that there are limits to the number of fixtures/types of fixtures on any drain line/stack (I think).
I have an addition planned. In it, I would like to replace one bathroom with a toilet, sink, and shower/tub with a new hall bath with double sink vanity, shower/tub, and toilet, as well as add a master bath with double vanity, toilet and shower (only).
Is it possible to put all of this on the one stack? My house is a 2 story, on the main level there is a double sink vanity, toilet, tub/shower bathroom. The main house stack runs from near that toilet to near the upstairs toilet directly above.
I know I have black pipe for my stack (some sort of pvc type pipe, not cast iron). How do I find its size?
My house was built in 1982.
And, if I have to add a stack, do I only need to add one, or more than one?